[AMRadio] BC-610 Master Oscillator Stability

[JAMES HANLON]

Bob,

If I were lucky enough to have a BC-610 and I wanted vfo control with more 
stability than I could get from the BC-610's own Master Oscillator mode, I 
would certainly try driving it in the Crystal Oscillator mode with an external 
vfo.  I've had very good results driving other rigs such as my Globe King 275 
and Collins 32RA with a Hallicrafters HT-18.  I also use several Knight vfos 
with such rigs as a Globe Scout and a DX-20.  If you have a concern about the 
BC-610 oscillator stage taking off in a TGTP self-oscillation mode when driven 
by something like the Knight vfo or a Heathkit VF-1 which hve a parallel 
resonant circuit in their outputs, just operate the vfo on one half of the 
desired frequency, on 160 meters when you are operating the 610 on 75 for 
example, and turn the BC-610 oscillator into a doubler.  You can get 160 meter 
output from a Knight vfo or from an AT-1.  

Jim Hanlon, W8KGI
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Re: [AMRadio] BC-610 fiasco Again

[Roger Basford]

Yer, maybe he's still in the pattern buffers?

Roger/G3VKM - who has been watching far too much Star Trek!


Message: 4
Date: Wed, 20 May 2009 18:20:08 -0400
From: "Bernie Doran" 
Subject: Re: [AMRadio] BC-610 fiasco Again
To: "Discussion of AM Radio in the Amateur Service"

Message-ID: <002b01c9d999$22b068e0$0202a...@bernie>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original

remember the BC1g that was on ebay for I think 50k, it was the first station
that played a piece by a long dead 50 s rock and roll star. maybe his
dna is still in the xmtr!!  Bernie W8RPW
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Re: [AMRadio] BC-610 fiasco Again

[Bernie Doran]

remember the BC1g that was on ebay for I think 50k, it was the first station 
that played a piece by a long dead 50 s rock and roll star. maybe his 
dna is still in the xmtr!!  Bernie W8RPW
- Original Message - 
From: "BILL GUYGER" 
To: "Discussion of AM Radio in the Amateur Service" 

Sent: Wednesday, May 20, 2009 5:42 PM
Subject: Re: [AMRadio] BC-610 fiasco Again


>
> Look at this guy's other items. He wants ungodly "Buy Now" prices for an 
> old RCA turntable and some JBL speakers just to mention a few! 
> Well..he can dream can't he?
>
>
> Bill AD5OL
>
>
> - Original Message 
> From: James M. Walker 
> To: amradio@mailman.qth.net
> Sent: Tuesday, May 19, 2009 11:28:14 PM
> Subject: [AMRadio] BC-610 fiasco Again
>
> Well it's back, and at a higher price than the last time.
> Maybe it's like aging fine wine!
>
> BC-610 you know where, Item number:200344030668
>
> Jim
> WB2FCN
> "What a Country"
>
>
> __
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio@mailman.qth.net
> To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> __
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio@mailman.qth.net
> To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
> the word unsubscribe in the message body.
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 


__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Re: [AMRadio] BC-610 fiasco Again

[BILL GUYGER]

Look at this guy's other items. He wants ungodly "Buy Now" prices for an old 
RCA turntable and some JBL speakers just to mention a few! Well..he can 
dream can't he?


Bill AD5OL


- Original Message 
From: James M. Walker 
To: amradio@mailman.qth.net
Sent: Tuesday, May 19, 2009 11:28:14 PM
Subject: [AMRadio] BC-610 fiasco Again

Well it's back, and at a higher price than the last time.
Maybe it's like aging fine wine!

BC-610 you know where, Item number:200344030668

Jim
WB2FCN
"What a Country"


__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

Re: [AMRadio] BC-610 fiasco Again

[John Dilks K2TQN]

Well I don't take any credit for the fiasco, but that "I" model is my 
old BC-610.  Looks good doesn't it?

I picked it up new at the Andrews AFB MARS station back in '68, 
complete with all coils, plug-ins, spares, tuner and speech amp.  It 
had just been uncrated.

I used it with AF-MARS, on RTTY in Hampton, VA, at my rental home and 
again when I came back to NJ after my service time. (I was assigned 
to the MARS station at Langley, AFB.   Great job! The AF moving 
company broke every step, in my rental, coming down from the second 
floor with that baby.  It worked perfectly when it arrived in NJ.)

Later, when I was building my new home and didn't have time or a 
place to store it, I gave it away to a local ham, who later sold it.

Looking at it now, I wish I still had it.  And NO, I don't intend to bid on it.

73, John Dilks, K2TQN

At 12:28 AM 5/20/2009, James M. Walker wrote:
>Well it's back, and at a higher price than the last time.
>Maybe it's like aging fine wine!
>
>BC-610 you know where, Item number:200344030668
>
>Jim
>WB2FCN
>"What a Country"

__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[AMRadio] BC-610 fiasco Again

[James M. Walker]

Well it's back, and at a higher price than the last time.
Maybe it's like aging fine wine!

BC-610 you know where, Item number:200344030668

Jim
WB2FCN
"What a Country"


__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[AMRadio] BC 610 Help

[John King]

I am aware of the T-368_BC-610 list, but I need some help as soon as I can get 
it, trying to locate the proper terminal upon which to attach a wire . It has 
to do with the exciter section and a wire that goes either to TS 1 or TS 2. If 
you have a BC 610 E handy, you may be able to look at yours and let me know the 
placement of the wire. 

Please contact me directly. Your assistance will be greatly appreciated. 73, 
John, K5PGW   


  
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Post: AMRadio@mailman.qth.net
To unsubscribe, send an email to amradio-requ...@mailman.qth.net with
the word unsubscribe in the message body.

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[AMRadio] BC-610-E and -H FS on QTH.com

[crawfish]

W9GOB near Chicago has a BC-610-E for $700. and an -H for $300. The -H needs a 
new T5.Pick up only. Ads #628858 and 628859.Usual disclaimers apply.

  Joe W4AAB
__
Our Main Website: http://www.amfone.net
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.

[AMRadio] BC-610 Modulation Transformer

[Geoff/W5OMR]

On http://www.ebay.com

 Item number: 330154275506

--
73 = Best Regards,
-Geoff/W5OMR

__
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.

Re: [AMRadio] BC-610's FS in Albany, N.Y.

[Peter Markavage]

It's easy enough to just copy and paste the URL here:
http://amfone.net/Amforum/index.php?topic=11608.0
 
On Wed, 25 Jul 2007 18:43:21 -0500 "crawfish" <[EMAIL PROTECTED]>
writes:
>  QTH.com Ad #608842 by WB2GCR. He references a listing on amfone. 
__
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.

[AMRadio] BC-610's FS in Albany, N.Y.

[crawfish]

 QTH.com Ad #608842 by WB2GCR. He references a listing on amfone. Usual 
disclaimers apply.
 Joe W4AAB
__
AMRadio mailing list
List Rules (must read!): http://w5ami.net/amradiofaq.html
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
To unsubscribe, send an email to [EMAIL PROTECTED] with
the word unsubscribe in the message body.

[AMRadio] BC-610 FS in Phoenix, AZ/Homebrew pair of 813 Transmitter in Western PA

[crawfish]

Check out the ads in the Antique Radio section of QTH.com's Want Ads. W7KPA the 
first one, K3ZH near Erie, PA for the second.  Both rigs $300. each. Usual 
disclaimers apply. The 813's transmitter is in a 6 foot rack.I would say one 
would need to bring a truck to haul either one.
  Joe W4AAB
__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[W4AWM]

Great Rick,

Let me know what happens.

73,  

John,  W4AWM
__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[Rick Brashear]

Thanks John.  I sent Frank an email.  I appreciate the insight on the 
TVI situation.  I am TVI free as it stands thanks to heavy shielding and 
filtering of the BC-610-E and I sure don't want to awaken that beast!  I 
have great, tolerant neighbors, but I don't think they would stay that 
way if I started interrupting the Cowboy games!


73,
Rick/K5IZ


Hi Rick, 

Try Frank, W4FRL.[EMAIL PROTECTED]423-727-0333  He had a Johnson 
switch at Shelby and I don't believe he sold it. I believe he was asking 
$70.00 for it.
 



__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[W4AWM]

Hi Rick, 

Try Frank, W4FRL.[EMAIL PROTECTED]423-727-0333  He had a Johnson 
switch at Shelby and I don't believe he sold it. I believe he was asking 
$70.00 for it, but he likes to trade.

Be aware that all those electronic switches are TVI generators of the highest 
order. My KW amps are completely clean using standard Dow Key relays, but 
then I tried a B & W and Johnson switch, I ran into all kinds of problems. I 
got 
into a cable driven TV set and all kinds of audio stuff. I subsequently sold 
both switches.

Back in my early days, I tried a Dow Key electronic switch and wiped out one 
whole end of town. I think that one is still around here somewhere, but I 
haven't seen it in years. It was connector mounted and got its operating 
voltage 
from the receiver.

73,  

John,  W4AWM
__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[Rick Brashear]

Thanks Jim...  I have tried two times to get a Johnson TR switch on the 
auction block, but both times they got completely out of reason on 
price, I thought.  I'll keep looking as I agree, that would be a great 
solution!  I had to pull the RF section off the "E" model to replace an 
over looked paper cap that was leaking gook, so it will afford me a 
chance to double check all the wiring to the original antenna shorting 
relay that has been removed.  The present Dow Key is connected to that 
location and should work from there, but something is amiss.  As you 
mentioned, I want to be sure I get the right thing keyed first, 
especially with the 390 I'm using with it.


By the way, I am looking for a round (old style) AC (0 - 150) volt panel 
meter.  It needs to be round and mount into a 3" diameter hole with 2 at 
the bottom and one at the top mounting screws configuration.


Thanks,
Rick/K5IZ


Welll,
A long time ago I tried the DowKey route, After
experiencing the "Zorch" phenomenon



__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[James M. Walker]

Welll,
A long time ago I tried the DowKey route, After
experiencing the "Zorch" phenomenon, I went to the
E.F. Johnson TR switch. Mainly for the power handling
capabilities, but also for the small amount of amplification
to the receiver, when in receive mode, the TRswitch RX
output is around 150 - 300 ohms which goes well with the
input on the HQ-129(X).

There is 115VAC available (on the E model modulator deck)
however it will require splicing into the lines. Also be careful
of the sequencing, especially with the R-390(*) receiver.

YMMV
Jim
WB2FCN

- Original Message - 
From: "Rick Brashear" <[EMAIL PROTECTED]>

To: 
Sent: Tuesday, September 12, 2006 4:39 PM
Subject: [AMRadio] BC-610-E


All you BC-610 gurus, please, put on your thinking caps.  Where is the 
BEST place to derive 117 vac for a Dow Key relay?  My "E" model came 
equipped with a Dow Key relay attached to the back all wired in.  
However, it's not an ideal set up.  It seems there is always enough 
voltage running through the coil to make the relay hum a little.  The 
main problem is it sometimes doesn't release good and switch the antenna 
back to the receiver due this voltage.  I haven't traced it to see 
exactly where this connection is made, but I know there has to be a 
better point.  Before I start digging through this heavy monster 
(remember the "E" is NOT very friendly when it comes to repair or 
servicing) I thought I'd get some ideas from those who have already made 
this connection.


Thanks,
Rick/K5IZ

__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net





__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[Rick Brashear]

Thanks Joe, that should do the trick.  The problem I have is I am using 
a BC-614-E speech Amplifier with a PTT modification on it so all works 
off the PTT switch on the microphone.  It's been too many years since I 
played the drums to think I could ever manipulate a foot switch and a 
mic switch without getting messed up!:-)there was a day, 
but it was  a long time ago!



It's all irrelevant now anyway.  I just got up from digging around 
inside the monster and found I have a RF bypass capacitor in the RF deck 
leaking oil and will have to pull the top off this old gal after all.  
Why couldn't this happen on the "H" or "I" model so I could just pull a 
deck out?


Thanks,
Rick

crawfish wrote:


Rick, what I did is take 120 vac , run one leg(the hot leg) through a BIG
footswitch to one side of the Dow-Key.

 



__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[crawfish]

Rick, what I did is take 120 vac , run one leg(the hot leg) through a BIG
footswitch to one side of the Dow-Key relay coil and run the neutral to the
other side of the coil.That works fine for me.
Joe W4AAB
- Original Message -
From: "Rick Brashear" <[EMAIL PROTECTED]>
To: 
Sent: Tuesday, September 12, 2006 3:39 PM
Subject: [AMRadio] BC-610-E


> All you BC-610 gurus, please, put on your thinking caps.  Where is the
> BEST place to derive 117 vac for a Dow Key relay?  My "E" model came
> equipped with a Dow Key relay attached to the back all wired in.
> However, it's not an ideal set up.  It seems there is always enough
> voltage running through the coil to make the relay hum a little.  The
> main problem is it sometimes doesn't release good and switch the antenna
> back to the receiver due this voltage.  I haven't traced it to see
> exactly where this connection is made, but I know there has to be a
> better point.  Before I start digging through this heavy monster
> (remember the "E" is NOT very friendly when it comes to repair or
> servicing) I thought I'd get some ideas from those who have already made
> this connection.
>
> Thanks,
> Rick/K5IZ
>
> __
> AMRadio mailing list
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Partner Website: http://www.amfone.net
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
>


__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[Rick Brashear]

Thanks John.  I was using a BC-348 with it for a while, but switched to 
the R-390 and now I need to redo the antenna switching system.


Rick

John Wright wrote:


I have the matching receiver to the BC-610 and it uses
a 12 volt DC

 



__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[John Wright]

I have the matching receiver to the BC-610 and it uses
a 12 volt DC (at least I think it is 12 volt it may be
24 volt but 12 trips it fine on the receiver)  line to
switch a relay (to mute the receiver and such).  The
control line is not easy to determine from the
schematic but it is there.   

For what it is worth.

 ~John~ n1fcu

--- [EMAIL PROTECTED] wrote:

> 
> In a message dated 9/12/06 1:40:23 PM,
> [EMAIL PROTECTED] writes:
> 
> 
> > Where is the
> > BEST place to derive 117 vac for a Dow Key relay? 
> > 
> 
> Rick,
> 
> Don't have one of these critters but looking at the
> "E" schematic it appears 
> that termainl strip   
> TS-4 on the back of the modulator deck would be the
> place.   Presuming the 
> power control wiring is original, of course.
> 
> Dennis D. W7QHO
> Glendale, CA
>
__
> AMRadio mailing list
> List Home:
> http://mailman.qth.net/mailman/listinfo/amradio
> Partner Website: http://www.amfone.net
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> 


__
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610-E

[W7QHO]

In a message dated 9/12/06 1:40:23 PM, [EMAIL PROTECTED] writes:


> Where is the
> BEST place to derive 117 vac for a Dow Key relay? 
> 

Rick,

Don't have one of these critters but looking at the "E" schematic it appears 
that termainl strip   
TS-4 on the back of the modulator deck would be the place.   Presuming the 
power control wiring is original, of course.

Dennis D. W7QHO
Glendale, CA
__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

[AMRadio] BC-610-E

[Rick Brashear]

All you BC-610 gurus, please, put on your thinking caps.  Where is the 
BEST place to derive 117 vac for a Dow Key relay?  My "E" model came 
equipped with a Dow Key relay attached to the back all wired in.  
However, it's not an ideal set up.  It seems there is always enough 
voltage running through the coil to make the relay hum a little.  The 
main problem is it sometimes doesn't release good and switch the antenna 
back to the receiver due this voltage.  I haven't traced it to see 
exactly where this connection is made, but I know there has to be a 
better point.  Before I start digging through this heavy monster 
(remember the "E" is NOT very friendly when it comes to repair or 
servicing) I thought I'd get some ideas from those who have already made 
this connection.


Thanks,
Rick/K5IZ

__
AMRadio mailing list
List Home: http://mailman.qth.net/mailman/listinfo/amradio
Partner Website: http://www.amfone.net
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net

Re: [AMRadio] BC-610 Modulation Transformer

[W5OMR/Geoff]

[EMAIL PROTECTED] wrote:

Heard you Q5 in Atlanta when you were signing off with WA4FUR. Couldn't QSY to 40 quick enough to catch you. 


73
--
Ernie, k0occ 
Atlanta, GA




Sorry about that.

I am home, again.  From San Antonio to Beaumont, TX, to New Orleans for 
5 days, to Orlando for 6 days (inclusive of Epcot [{E}very {P}erson 
{C}omes {O}ut {T}ired], over to Cape Canaveral (shuttle is 'secure!' no 
viewing) up through Jacksonville, FL to Brunswick, GA, up to Charleston, 
SC, over to Altanta, GA, down to Brookhaven, MS, and  back to San 
Antonio this evening.  Was gone from 14 May thru today (29 May)


Good to see and meet WW9W, N3DR, KG4UVU (and XYL KG4ZPJ - I think?) and 
re-meet Jeff/W0XV and oh, what a pleasure it was to operate that 
'souped-up' 30V-2.  Beautiful work by Robert/W0VMC, both cosmetically, 
and electrically.  4-400's mod'ed by 4-400's.  AWESOME rig!


Pictures will be forthcoming.

--
73 = Best Regards,
-Geoff/W5OMR (home again)

Re: [AMRadio] BC-610 Modulation Transformer

[W7QHO]

In a message dated 5/27/06 2:36:10 PM, [EMAIL PROTECTED] writes:


> You've got it, John. That accurately describes the terminals on my
> BC-610D transformer, anyway.
> 
> 
Larry,

My copy of TM 11-280 (SCR-299) indicates the terminals as being marked B and 
P respectively for the B+ and Plate ends othe windings.   Any markings on your 
unit?

Dennis D. W7QHO
Glendale, CA

Re: [AMRadio] BC-610 Modulation Transformer

[Larry Szendrei]

You've got it, John. That accurately describes the terminals on my 
BC-610D transformer, anyway.


-Larry/NE1S

John E. Coleman (ARS WA5BXO) wrote:

I think the XFMR has four connectors on one end and two on the other end.
The bottom two of the four are to be strapped and make the B+ connection for
the modulator.  The top two, of the four, are the modulator plate
connectors.  The two on the other end are the secondary winding to go to the
final plate circuit.

This is from memory and pictures, so don't take it for 100% accuracy.

John, WA5BXO

Re: [AMRadio] BC-610 Modulation Transformer

[k0occ]

Heard you Q5 in Atlanta when you were signing off with WA4FUR. Couldn't QSY to 
40 quick enough to catch you. 

73
--
Ernie, k0occ 
Atlanta, GA

-- Original message -- 
From: W5OMR/Geoff <[EMAIL PROTECTED]> 

> John E. Coleman (ARS WA5BXO) wrote: 
> 
> >I think the XFMR has four connectors on one end and two on the other end. 
> >The bottom two of the four are to be strapped and make the B+ connection for 
> >the modulator. The top two, of the four, are the modulator plate 
> >connectors. The two on the other end are the secondary winding to go to the 
> >final plate circuit. 
> > 
> >This is from memory and pictures, so don't take it for 100% accuracy. 
> > 
> 
> I'm thinking that's correct, John. I just had both of my '610 mod xfmrs 
> in the truck, and dropped 'em off at W5KGZ in Beaumont, on the 16th of 
> May. Maybe you could send Perry some email, and ask him. 
> 
> Greetings y'all, from Brunswick, Georgia. Leaving here in 1 hour, and 
> headed to Charleston, SC. 
> 
> If anyone is around, I'll be /m4 on 7290~7295kc AM. Listen up, 
> though... my amp dumped on me, so I'm down to 30w outta the bugcatcher. 
> Good reports so far, though. 
> 
> Have had a good trip, with on-air QSO's with K4CR, WA4FUR, WW9W and 
> eyeball QSO's w/WW9W/Robert (another good looking BC-610 in Punta Gorda, 
> FL) and N3DP/Don, and numerous connections via IRLP back to San 
> Antonio. Good Radio time, with the exception of a broken wire at the 
> impedance matching coil (inside the insulation), causing high SWR, and 
> consequently, burning out one or both of the 2SC2879 transistors in the 
> amp. :-( 
> 
> Calling CQ 40m, from the pissweak mobile, W5OMR/4 
> 
> -- 
> 73 = Best Regards 
> 
> __ 
> AMRadio mailing list 
> Home: http://mailman.qth.net/mailman/listinfo/amradio 
> Help: http://mailman.qth.net/mmfaq.html 
> Post: mailto:AMRadio@mailman.qth.net 
> AMfone Website: http://www.amfone.net 
> AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb 
From [EMAIL PROTECTED]  Fri May 26 16:08:18 2006
Return-Path: <[EMAIL PROTECTED]>
X-Original-To: amradio@mailman.qth.net
Delivered-To: amradio@mailman.qth.net
Received: from ms-smtp-06.tampabay.rr.com (ms-smtp-06.tampabay.rr.com
[65.32.5.136]) by mailman.qth.net (Postfix) with ESMTP id 0125F859C54
for ; Fri, 26 May 2006 16:08:17 -0400 (EDT)
Received: from BRY_OFFICE (13.144.119.70.cfl.res.rr.com [70.119.144.13])
by ms-smtp-06.tampabay.rr.com (8.13.6/8.13.6) with ESMTP id
k4QK2rjG019703
for ; Fri, 26 May 2006 16:02:57 -0400 (EDT)
From: "Brian Carling" <[EMAIL PROTECTED]>
To: amradio@mailman.qth.net
Date: Fri, 26 May 2006 16:02:52 -0400
MIME-Version: 1.0
Message-ID: <[EMAIL PROTECTED]>
Priority: normal
X-mailer: Pegasus Mail for Windows (4.21c)
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Content-description: Mail message body
X-Virus-Scanned: Symantec AntiVirus Scan Engine
Subject: [AMRadio] OP says: "WHJY RUN AM?"
X-BeenThere: amradio@mailman.qth.net
X-Mailman-Version: 2.1.4
Precedence: list
Reply-To: [EMAIL PROTECTED], Discussion of AM Radio 
List-Id: Discussion of AM Radio 
List-Unsubscribe: ,

List-Archive: 
List-Post: 
List-Help: 
List-Subscribe: ,

X-List-Received-Date: Fri, 26 May 2006 20:08:18 -

Hi Larry,

I am sure that others can address this more comprehensively for 
you. We are glad to tell about why we love AM so much!

Well, it is just a WHOLE LOT of enjoyment running AM, listening 
to those dulcet tones of AM on the other end.
It is far more relaxing to listen to than the  hyped up pumping 
sounds of the typical distorted duck-cuacking SSB signal.
Not that some of us do not also enjoy using SSB and other
modes from time to time. The fidelity is generally far better
and the background noise often gets blanked nicely by the 
carrier. Much easier on the ears and the soul!

You just have to experience AM for yourself.

It is not "going back" when you use "Advanced Modulation."

73 - Brian, AF4K

Larry writes from - [EMAIL PROTECTED]

> Please excuse the 'aparent' ignorance of this question, as I think I already 
> know the answer to it.. I just want to read other people's opinion
> 
> Why do hams want to return to AM and / or tube rigs?...
> 
> Larry ve3fxq
> 
> 
>   - Original Message - 
>   From: Brian Carling 
>   To: [EMAIL PROTECTED] ; amradio@mailman.qth.net ; [EMAIL PROTECTED] ; 
> [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] 
> ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] ; [EMAIL PROTECTED] 
>   Sent: Friday, May 26, 2006 8:39 AM
>   Subject: [FLBOATANCHORS] 40m AM Operation
> 
> 
>   Great Gar

Re: [AMRadio] BC-610 Modulation Transformer

[W5OMR/Geoff]

John E. Coleman (ARS WA5BXO) wrote:


I think the XFMR has four connectors on one end and two on the other end.
The bottom two of the four are to be strapped and make the B+ connection for
the modulator.  The top two, of the four, are the modulator plate
connectors.  The two on the other end are the secondary winding to go to the
final plate circuit.

This is from memory and pictures, so don't take it for 100% accuracy.



I'm thinking that's correct, John.  I just had both of my '610 mod xfmrs 
in the truck, and dropped 'em off at W5KGZ in Beaumont, on the 16th of 
May.  Maybe you could send Perry some email, and ask him.


Greetings y'all, from Brunswick, Georgia.  Leaving here in 1 hour, and 
headed to Charleston, SC.


If anyone is around, I'll be /m4 on 7290~7295kc AM.  Listen up, 
though... my amp dumped on me, so I'm down to 30w outta the bugcatcher.  
Good reports so far, though.


Have had a good trip, with on-air QSO's with K4CR, WA4FUR, WW9W and 
eyeball QSO's w/WW9W/Robert (another good looking BC-610 in Punta Gorda, 
FL) and N3DP/Don, and numerous connections via IRLP back to San 
Antonio.  Good Radio time, with the exception of a broken wire at the 
impedance matching coil (inside the insulation), causing high SWR, and 
consequently, burning out one or both of the 2SC2879 transistors in the 
amp. :-(


Calling CQ 40m, from the pissweak mobile, W5OMR/4

--
73 = Best Regards

RE: [AMRadio] BC-610 Modulation Transformer

[John E. Coleman (ARS WA5BXO)]

I think the XFMR has four connectors on one end and two on the other end.
The bottom two of the four are to be strapped and make the B+ connection for
the modulator.  The top two, of the four, are the modulator plate
connectors.  The two on the other end are the secondary winding to go to the
final plate circuit.

This is from memory and pictures, so don't take it for 100% accuracy.

John, WA5BXO

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of crawfish
Sent: Friday, May 26, 2006 2:32 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] BC-610 Modulation Transformer

It is open-frame. I need the pin outs(wiring diagram to pins, etc.). I
ordered a manual from the surplus place in Lima, OH. Hopefully I will have
QRO on 160 by this fall. BC-339 will be QRO on 75,40, and 20.
  Joe W4AAB

Re: [AMRadio] BC-610 Modulation Transformer

[crawfish]

It is open-frame. I need the pin outs(wiring diagram to pins, etc.). I
ordered a manual from the surplus place in Lima, OH. Hopefully I will have
QRO on 160 by this fall. BC-339 will be QRO on 75,40, and 20.
  Joe W4AAB
- Original Message -
From: "Rick Brashear" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Thursday, May 25, 2006 9:09 AM
Subject: Re: [AMRadio] BC-610 Modulation Transformer


> Is it open frame or potted?  The reason I ask is because the open frame
> style like in the 610 "E" has a definite tendency to "talk back" where
> as the potted transformers are less likely to do so.  If nothing else,
> you have a very sought after transformer.
>
> Rick/K5IZ
>
> crawfish wrote:
>
> >I was given a BC-610 modulation transformer this past weekend at Dayton,
and need specs on it. I know the -610 used 100TH's, but have other
tubes(HK254, 4-125's, 813's). Trying to find portion of the TM on the BC-610
that has the schematic.
> >   Joe W4AAB
> >__
> >AMRadio mailing list
> >Home: http://mailman.qth.net/mailman/listinfo/amradio
> >Help: http://mailman.qth.net/mmfaq.html
> >Post: mailto:AMRadio@mailman.qth.net
> >AMfone Website: http://www.amfone.net
> >AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
> >
> >
> >
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

Re: [AMRadio] BC-610 Modulation Transformer

[Rick Brashear]

Is it open frame or potted?  The reason I ask is because the open frame 
style like in the 610 "E" has a definite tendency to "talk back" where 
as the potted transformers are less likely to do so.  If nothing else, 
you have a very sought after transformer. 


Rick/K5IZ

crawfish wrote:


I was given a BC-610 modulation transformer this past weekend at Dayton, and 
need specs on it. I know the -610 used 100TH's, but have other tubes(HK254, 
4-125's, 813's). Trying to find portion of the TM on the BC-610 that has the 
schematic.
  Joe W4AAB
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

 

[AMRadio] BC-610 Modulation Transformer

[crawfish]

I was given a BC-610 modulation transformer this past weekend at Dayton, and 
need specs on it. I know the -610 used 100TH's, but have other tubes(HK254, 
4-125's, 813's). Trying to find portion of the TM on the BC-610 that has the 
schematic.
   Joe W4AAB
From [EMAIL PROTECTED]  Thu May 25 00:15:25 2006
Return-Path: <[EMAIL PROTECTED]>
X-Original-To: amradio@mailman.qth.net
Delivered-To: amradio@mailman.qth.net
Received: from hotmail.com (bay114-f24.bay114.hotmail.com [65.54.169.34])
by mailman.qth.net (Postfix) with ESMTP id A0410859C17
for ; Thu, 25 May 2006 00:15:25 -0400 (EDT)
Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC;
Wed, 24 May 2006 21:10:15 -0700
Message-ID: <[EMAIL PROTECTED]>
Received: from 65.54.169.200 by by114fd.bay114.hotmail.msn.com with HTTP;
Thu, 25 May 2006 04:10:10 GMT
X-Originating-IP: [66.168.100.13]
X-Originating-Email: [EMAIL PROTECTED]
X-Sender: [EMAIL PROTECTED]
In-Reply-To: <[EMAIL PROTECTED]>
From: "Donald Chester" <[EMAIL PROTECTED]>
To: amradio@mailman.qth.net
Subject: RE: [AMRadio] BC-610 Modulation Transformer
Date: Thu, 25 May 2006 04:10:10 +
Mime-Version: 1.0
Content-Type: text/plain; format=flowed
X-OriginalArrivalTime: 25 May 2006 04:10:15.0396 (UTC)
FILETIME=[2044DA40:01C67FB1]
X-BeenThere: amradio@mailman.qth.net
X-Mailman-Version: 2.1.4
Precedence: list
Reply-To: Discussion of AM Radio 
List-Id: Discussion of AM Radio 
List-Unsubscribe: <http://mailman.qth.net/mailman/listinfo/amradio>,
<mailto:[EMAIL PROTECTED]>
List-Archive: <http://mailman.qth.net/mailman/private/amradio>
List-Post: <mailto:amradio@mailman.qth.net>
List-Help: <mailto:[EMAIL PROTECTED]>
List-Subscribe: <http://mailman.qth.net/mailman/listinfo/amradio>,
<mailto:[EMAIL PROTECTED]>
X-List-Received-Date: Thu, 25 May 2006 04:15:26 -


>From: "crawfish" <[EMAIL PROTECTED]>

>I was given a BC-610 modulation transformer this past weekend at Dayton,
>and need specs on it. I know the -610 used 100TH's, but have other
>tubes(HK254, 4-125's, 813's). Trying to find portion of the TM on the
>BC-610 that has the schematic.


It's about 20K plate-to-plate primary to 8K secondary.  The 610 runs 2000
volts at 250 mills to the final, making the modulating impedance 8000 ohms.
The turns ratio is abot 1.65:1, so the impedance ratio is just under 3:1.
The transformer should be useful for any class-C load impedance between
about 5K and  12k, provided the DC through the secondary doesn't exceed 300
mills or so.  Naturally the 3X load impedance will be reflected back to the
modulator tubes.

Using a common power supply for modulator and final, with this transformer
don't expect to get much over 100% positive peak modulation capability,
because of the stepdown ratio.  For higher positive peaks you will have to
run higher voltage on the modulator than on the final.

Don k4kyv

Re: [AMRadio] BC-610 & Belton

[W5OMR/Geoff]

--- W5OMR/Geoff <[EMAIL PROTECTED]> wrote:

 


Sad to report, but I will not be going to Belton, TX
nor taking my 
BC-610 for sale.


The Death yesterday morning of a very dear friend
precludes me from 
traveling this weekend.  The rosary is Friday, the

funeral is Saturday.

My apologies to those who had made travel plans.
   


Barry Sherwood wrote:

Sorry to hear about your friend's death. Was he a ham?
May the maker be with you in your mourning.

Barry, KF5GC



He was not.  He was, however, helpful in providing me some scrape 
tempered plate-glass for the homebrewed 250TH modulator 'windows'.


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] BC-610 & Belton

[Barry Sherwood]

Sorry to hear about your friend's death. Was he a ham?
May the maker be with you in your mourning.

Barry, KF5GC

--- W5OMR/Geoff <[EMAIL PROTECTED]> wrote:

> Sad to report, but I will not be going to Belton, TX
> nor taking my 
> BC-610 for sale.
> 
> The Death yesterday morning of a very dear friend
> precludes me from 
> traveling this weekend.  The rosary is Friday, the
> funeral is Saturday.
> 
> My apologies to those who had made travel plans.
> 
> --
> 73 = Best Regards,
> -Geoff/W5OMR
> 
> 
>
__
> AMRadio mailing list
> Home:
> http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami, Paul
> Courson/wa3vjb
> 


__
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 

[AMRadio] BC-610 & Belton

[W5OMR/Geoff]

Sad to report, but I will not be going to Belton, TX nor taking my 
BC-610 for sale.


The Death yesterday morning of a very dear friend precludes me from 
traveling this weekend.  The rosary is Friday, the funeral is Saturday.


My apologies to those who had made travel plans.

--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] : BC 610 needing POWER 220VAC

[W5OMR/Geoff]

Rick Brashear wrote:

You're sure right about the twist plug, Geoff.  I replaced my two 
prong with a three prong twist and it was a booger bear to find one to 
fit into the hole.  I finally stumbled across one (literally!) over in 
Ft. Worth at Nortex.


Someone mentioned a dedicated AC line and running it through a 25 amp 
variable transformer for their 610, that's the same set up I use.


Has anyone experienced distorted audio when using a BC-614 when "High 
Voltage Protect" is on?  The "E" model doesn't have this problem, but 
when I tried to check out my BC-614-H on the 610-H I got real 
distorted audio in low power.  All works great in the "Normal" position.



I'm sure it's because of the bias being 'fixed' (variable by the front 
panel rheostat) but that's severly reduced B+ when that switch is on.  
Not nearly voltage to bias off the 100TH's, to have anything resembling 
'smooth' audio.


That, or the bias voltage is also reduced, when the B+ is lowered. 


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

Sounds good to me Don, that's the only way I ever run it anyway, wide 
open.  Although I do have a variac in line it is to insure the line 
voltage doesn't get too high.  In my area it sometimes jumps as high as 
125 volts and that would do the old power tranny no good at all.  So, I 
have a line voltage monitor and variac to keep the voltage to 115 - 117 
volts.


Rick

Donald Chester wrote:




From: Rick Brashear <[EMAIL PROTECTED]>



Well, Brian, you are right, the 11 ohm dropping resistor is only in 
series with the plate transformer... Of course, you're also right as 
is Jim that this would throw the modulation bias off... As indicated 
earlier, it's easy enough to operate with lower power by simply 
adjusting the coupling.  I say "easier" sometimes that rascal can be 
real touchy.



It's best to run the BC-610 in the full power mode.  HV protect is for 
tuning up without risking damage to the final tube or other 
components.  Running the rig in HV protect will result in very poor 
voltage regulation on the final, due to the series dropping resistor 
in the HV xfmr primary.  Running it with reduced loading will throw 
the load impedance to the modulation transformer way off, with the 
possibility of blowing the xfmr or arcing something over in the final.


The only proper way to reduce power would be to operate the plate 
transformer from a variac or some other kind of autotransformer, to 
provide a well-regulated source of reduced a.c. line voltage.  Then 
the modulator bias would have to be reduced, but that would require 
extensive modifications, due to the combined audio driver 
plate/modulator bias power supply arrangement.


Best to just run the BC-610 according to the stock instructions in the 
manual, if you are not confident about doing extensive modifications 
to the rig.


Don k4kyv


___

This message was typed using the DVORAK keyboard layout.  Try it - 
you'll like it.

http://www.mwbrooks.com/dvorak/
http://gigliwood.com/abcd/


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Donald Chester]

From: Rick Brashear <[EMAIL PROTECTED]>


Well, Brian, you are right, the 11 ohm dropping resistor is only in series 
with the plate transformer... Of course, you're also right as is Jim that 
this would throw the modulation bias off... As indicated earlier, it's easy 
enough to operate with lower power by simply adjusting the coupling.  I say 
"easier" sometimes that rascal can be real touchy.


It's best to run the BC-610 in the full power mode.  HV protect is for 
tuning up without risking damage to the final tube or other components.  
Running the rig in HV protect will result in very poor voltage regulation on 
the final, due to the series dropping resistor in the HV xfmr primary.  
Running it with reduced loading will throw the load impedance to the 
modulation transformer way off, with the possibility of blowing the xfmr or 
arcing something over in the final.


The only proper way to reduce power would be to operate the plate 
transformer from a variac or some other kind of autotransformer, to provide 
a well-regulated source of reduced a.c. line voltage.  Then the modulator 
bias would have to be reduced, but that would require extensive 
modifications, due to the combined audio driver plate/modulator bias power 
supply arrangement.


Best to just run the BC-610 according to the stock instructions in the 
manual, if you are not confident about doing extensive modifications to the 
rig.


Don k4kyv


___

This message was typed using the DVORAK keyboard layout.  Try it - you'll 
like it.

http://www.mwbrooks.com/dvorak/
http://gigliwood.com/abcd/

RE: [AMRadio] : BC 610 needing POWER 220VAC

[W1EOF]

I believe it's a little more complicated:

1. If you want to use two circuits, one from each side/phase then you you
should use a double breaker so that if one side blows the other one does
too.

2. I would fuse each side of the circuit at the radio. (Add a secondary fuse
for the plate supply primary).

3. I would provide some protective circuitry (relays) such that if you lose
the low-level circuits it kills the plate supply as well. Bad for the radio
and potentially dangerous if what appears to be a dark/dead radio in fact
has live B+.

That's my $.02

73,

Mark W1EOF


> -Original Message-
> From: Rbethman [mailto:[EMAIL PROTECTED]
> Sent: Saturday, April 08, 2006 12:13 PM
> To: Discussion of AM Radio
> Subject: Re: [AMRadio] : BC 610 needing POWER 220VAC
>
>
> All,
>
> There is ONE overriding issue to think about carefully here!
>
> The SINGLE 110VAC feed to the BC-610, ALSO goes through a SINGLE front
> panel fuse!
>
> IF someone desires to use TWO disparate 110VAC feeds, FUSE THE SECOND
> ONE ALSO!
>
> Bob - N0DGN
>
> John Coleman ARS WA5BXO wrote:
>
> > I really have no idea if it is wired for 110 or 220.  I know
> >that the Plate XFMR is 110VAC and if it were me I would wire a separate
> >primary circuit for the plate XFMR.  Just for the load balance.  If the
> >filaments and low voltage stuff is all run from side A of a 220 circuit
> >and the plate XFMR from side B then it is feasible that the filaments
> >and low voltage supplies would be more stable.  And the pilot lamps
> >would not dim as much.  That is important when you're trying to write in
> >the log while talking on the air by the light of pilot lamps only, HIHI.
> >
> >John, WA5BXO
> >
> >
>Bob Bethman - NØDGN
> +--+
> | NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
> +---+--+
> |   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
> +---+--+
> | Bob Bethman\\\|/// " The absence of a danger |
> | rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
> |   (/ @ @ /)  that everything is OK " |
> +-oOOo-(_)-oOOo+
> |   <http://home.comcast.net/~rbethman>|
> | 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
> |  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
> +-.oooO---Oooo.+
> | () ()|
> |  \  (   )  / |
> |   \ _) ( _/  |
> +--+
> | Amateur Astronomer - Celestron Nexstar 8 - Megrez 80mm SD II |
> | 12" f5 Dob coming soon!  Being built |
> |   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
> +--+
> |   Opinions expressed are that of my own and do not necessarily   |
> | coincide with or represent those of ANYONE else  |
> +--+
> |ALL E-mail received and sent scanned by AVG & Norton System Works |
>
>
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.385 / Virus Database: 268.4.0/304 - Release Date: 4/7/06
>
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.385 / Virus Database: 268.4.0/304 - Release Date: 4/7/06

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rbethman]

All,

There is ONE overriding issue to think about carefully here!

The SINGLE 110VAC feed to the BC-610, ALSO goes through a SINGLE front 
panel fuse!


IF someone desires to use TWO disparate 110VAC feeds, FUSE THE SECOND 
ONE ALSO!


Bob - N0DGN

John Coleman ARS WA5BXO wrote:


I really have no idea if it is wired for 110 or 220.  I know
that the Plate XFMR is 110VAC and if it were me I would wire a separate
primary circuit for the plate XFMR.  Just for the load balance.  If the
filaments and low voltage stuff is all run from side A of a 220 circuit
and the plate XFMR from side B then it is feasible that the filaments
and low voltage supplies would be more stable.  And the pilot lamps
would not dim as much.  That is important when you're trying to write in
the log while talking on the air by the light of pilot lamps only, HIHI.

John, WA5BXO 
 


  Bob Bethman - NØDGN
+--+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+-.oooO---Oooo.+
| () ()|
|  \  (   )  / |
|   \ _) ( _/  |
+--+
| Amateur Astronomer - Celestron Nexstar 8 - Megrez 80mm SD II |
| 12" f5 Dob coming soon!  Being built |
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--+
|ALL E-mail received and sent scanned by AVG & Norton System Works |


   

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

Well, Brian, you are right, the 11 ohm dropping resistor is only in 
series with the plate transformer.  I was incorrect thinking it dropped 
the voltage across everything.  Of course, you're also right as is Jim 
that this would throw the modulation bias off.  Thanks guys, you have 
enlightened me.  I have no need or desire to operate in the HV Protect 
mode, I was just curious about the difference when I was checking out 
the 614.  As indicated earlier, it's easy enough to operate with lower 
power by simply adjusting the coupling.  I say "easier" sometimes that 
rascal can be real touchy.


Thanks,
Rick/K5IZ

 

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Brian Sherrod]

On Saturday 08 April 2006 9:16 am, James M. Walker wrote:
> The BC-610, does not operate properly, when the front panel
> switch is in "protect" or "tune" mode, if you are on AM. Bias
> voltages change all around as the "tune/protect" position switches
> in a series dropping resistor to the 115 VAC main input.
>
I may be wrong, however I thought that ONLY the HV plate voltage circuit was 
reduced via the wire wound power resistor inline with the primary side when 
HV protect is on.  Seems that dropped the primary voltage to about 70 volts.  
The bias, filament, etc. stay the same on mine, and should!  

Still doesn't mean you can operate phone like this without adjusting the bias 
to compensate on the modulator's...  I have done this using the winding of a 
large 12v transformer in series instead of the stock resistor in the 610.  Of 
course there is some change needed in the bias to compensate.

Brian / w5ami

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

EXCELLENT!  Thanks Jim.  I obviously wasn't thinking or I would have 
realized the voltages throughout would be reduced and it could not 
operate properly. 


73,
Rick/K5IZ

James M. Walker wrote:


The BC-610, does not operate properly, when the front panel
switch is in "protect" or "tune" mode, if you are on AM. Bias
voltages change all around as the "tune/protect" position switches
in a series dropping resistor to the 115 VAC main input.

The manual, says tune in CW mode, using the tune position.
Dip the plate current, "to get you in the ball park. Then go to
operate, and peak the grid drive to the 250TH, and also with
no modulation set the modulator current to 40 MA resting.
The driver stages 6V6 through to 2X807s can be peaked
by turning on the exciter plate power switch. If you are getting
distortion in the "protect/tune" position, that is correct as the
bias, HV and drive are all off normal.

You "CAN'T" reduce power by operating in tune position
without getting distortion. The manual says, to run at reduced
RF output, decrease the output coupling swinging link position
to reduce RF output to the level you want.

As always,
YMMV
Jim
WB2FCN

 

 

Re: [AMRadio] : BC 610 needing POWER 220VAC

[James M. Walker]

Well,
I think it is more of a math topic.
As in 20 goes into 63 more times than 63 can go into 20!
YMMV
Jim
WB2FCN
> John you just need to go get the 2 20's and prove her wrong
> I did that twice and wound up in divorce court twice  HI...
> My third has never made that statement...God at 63 years old two 20's
> Dreamer !!!  Is this an AM topic???
> 
> Bob W1PE

Re: [AMRadio] : BC 610 needing POWER 220VAC

[James M. Walker]

The BC-610, does not operate properly, when the front panel
switch is in "protect" or "tune" mode, if you are on AM. Bias
voltages change all around as the "tune/protect" position switches
in a series dropping resistor to the 115 VAC main input.

The manual, says tune in CW mode, using the tune position.
Dip the plate current, "to get you in the ball park. Then go to
operate, and peak the grid drive to the 250TH, and also with
no modulation set the modulator current to 40 MA resting.
The driver stages 6V6 through to 2X807s can be peaked
by turning on the exciter plate power switch. If you are getting
distortion in the "protect/tune" position, that is correct as the
bias, HV and drive are all off normal.

You "CAN'T" reduce power by operating in tune position
without getting distortion. The manual says, to run at reduced
RF output, decrease the output coupling swinging link position
to reduce RF output to the level you want.

As always,
YMMV
Jim
WB2FCN


- Original Message - 
From: "Rick Brashear" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Saturday, April 08, 2006 9:49 AM
Subject: Re: [AMRadio] : BC 610 needing POWER 220VAC


> You're sure right about the twist plug, Geoff.  I replaced my two prong 
> with a three prong twist and it was a booger bear to find one to fit 
> into the hole.  I finally stumbled across one (literally!) over in Ft. 
> Worth at Nortex.
> 
> Someone mentioned a dedicated AC line and running it through a 25 amp 
> variable transformer for their 610, that's the same set up I use.
> 
> Has anyone experienced distorted audio when using a BC-614 when "High 
> Voltage Protect" is on?  The "E" model doesn't have this problem, but 
> when I tried to check out my BC-614-H on the 610-H I got real distorted 
> audio in low power.  All works great in the "Normal" position. 
> 
> Rick
> 
> 
> W5OMR/Geoff wrote:
> 
> >
> >
> > I think ya'll are all missing the point... the BC-610 has a twist-plug 
> > recepticle on the back of it  the blades are curved.  If one didn't 
> > know better, one might think that the BC-610 used a special plug, that 
> > connected to 220VAC.  It does not.
> > Jim, if your friend has the rig, and has the plug that goes into the 
> > back of it (and everything else needed for it) then yeah, you could 
> > puot it on 75m AM phone.  The single 250TH modulated by a pair of 
> > 100TH's was a military wonderment, in it's day.
> >
> > -- 
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> >
> > __
> > AMRadio mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/amradio
> > Help: http://mailman.qth.net/mmfaq.html
> > Post: mailto:AMRadio@mailman.qth.net
> > AMfone Website: http://www.amfone.net
> > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
> >
> 
> 
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
> 
> 
> 

RE: [AMRadio] : BC 610 needing POWER 220VAC

[Bob Peters]

John you just need to go get the 2 20's and prove her wrong
I did that twice and wound up in divorce court twice  HI...
My third has never made that statement...God at 63 years old two 20's
Dreamer !!!  Is this an AM topic???

Bob W1PE

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rick Brashear
Sent: Saturday, April 08, 2006 8:52 AM
To: Discussion of AM Radio
Subject: Re: [AMRadio] : BC 610 needing POWER 220VAC

John,

Be careful what you tell your wife, I told mine basically the same thing

and she put me out to pasture to find 'em!  :-)

Rick

John Coleman ARS WA5BXO wrote:

>   I really have no idea if it is wired for 110 or 220.  I know
>that the Plate XFMR is 110VAC and if it were me I would wire a separate
>primary circuit for the plate XFMR.  Just for the load balance.  If the
>filaments and low voltage stuff is all run from side A of a 220 circuit
>and the plate XFMR from side B then it is feasible that the filaments
>and low voltage supplies would be more stable.  And the pilot lamps
>would not dim as much.  That is important when you're trying to write
in
>the log while talking on the air by the light of pilot lamps only,
HIHI.
>
>
>   I told my wife I was going to get two 20 year olds to replace
>her and she told me I was not wired for 220.
>
>   I'm gonna go disinfect some ice cubes.
>
>John, WA5BXO 
>
>
>
>
>__
>AMRadio mailing list
>Home: http://mailman.qth.net/mailman/listinfo/amradio
>Help: http://mailman.qth.net/mmfaq.html
>Post: mailto:AMRadio@mailman.qth.net
>AMfone Website: http://www.amfone.net
>AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
>
>  
>


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

Re: [AMRadio] : BC 610

[Donald Chester]

I have always used John's idea of putting the HV plate transformers on one 
side of the a.c. line and all the rest on the other side, with my homebrew 
HF-300 rig (in which everything runs off a 115-volt primary).  That way, the 
voltage sag caused by the current pulled by the modulator ADDS to the 
primary line voltage at filament transformers and low-voltage plate 
supplies.  My pilot lights actully get slightly brighter under modulation.  
This is addition to the initial voltage kick-up caused by the current pulled 
by the rf finals, as soon as the transmitter switches to the transmit mode. 
Of course, the HV still sags normally as the power supply is loaded.


Although I have never tried it, another idea, which might help modulation 
linearity with an especially poorly regulated power line, would be to run 
separate modulator and rf final plate supplies, and put the rf final on one 
side of the line and the modulator on the other, giving the rf final 
filament and plate voltages a boost under modulation.


When my station was in the upstairs bedroom in the house, the line voltage 
would vary as much as 5 volts when the transmitter kicked in full strap.  
Now that my station is in a separate shack outside the house, with heavy 
duty wiring running out to it, the variation is less than 2 volts.


Don k4kyv
___

This message was typed using the DVORAK keyboard layout.  Try it - you'll 
like it.

http://www.mwbrooks.com/dvorak/
http://gigliwood.com/abcd/

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

John,

Be careful what you tell your wife, I told mine basically the same thing 
and she put me out to pasture to find 'em!  :-)


Rick

John Coleman ARS WA5BXO wrote:


I really have no idea if it is wired for 110 or 220.  I know
that the Plate XFMR is 110VAC and if it were me I would wire a separate
primary circuit for the plate XFMR.  Just for the load balance.  If the
filaments and low voltage stuff is all run from side A of a 220 circuit
and the plate XFMR from side B then it is feasible that the filaments
and low voltage supplies would be more stable.  And the pilot lamps
would not dim as much.  That is important when you're trying to write in
the log while talking on the air by the light of pilot lamps only, HIHI.


I told my wife I was going to get two 20 year olds to replace
her and she told me I was not wired for 220.

I'm gonna go disinfect some ice cubes.

John, WA5BXO 





__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

 

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

You're sure right about the twist plug, Geoff.  I replaced my two prong 
with a three prong twist and it was a booger bear to find one to fit 
into the hole.  I finally stumbled across one (literally!) over in Ft. 
Worth at Nortex.


Someone mentioned a dedicated AC line and running it through a 25 amp 
variable transformer for their 610, that's the same set up I use.


Has anyone experienced distorted audio when using a BC-614 when "High 
Voltage Protect" is on?  The "E" model doesn't have this problem, but 
when I tried to check out my BC-614-H on the 610-H I got real distorted 
audio in low power.  All works great in the "Normal" position. 


Rick


W5OMR/Geoff wrote:




I think ya'll are all missing the point... the BC-610 has a twist-plug 
recepticle on the back of it  the blades are curved.  If one didn't 
know better, one might think that the BC-610 used a special plug, that 
connected to 220VAC.  It does not.
Jim, if your friend has the rig, and has the plug that goes into the 
back of it (and everything else needed for it) then yeah, you could 
puot it on 75m AM phone.  The single 250TH modulated by a pair of 
100TH's was a military wonderment, in it's day.


--
73 = Best Regards,
-Geoff/W5OMR


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

Re: [AMRadio] : BC 610

[James M. Walker]

Well,
BC-610 transmitter are usually run on 115 VAC. There are
some exceptions to the overall statement however. The BC-610(E)
model has a transformer that has one primary winding for the HV
transformer, at 115 VAC. When you move to GHI models the
HV transformer has a dual primary winding, and also there is
a barrier strip on the power supply chassis, which will allow you
to control the AC input to the HV transformer separate from the
rest of the transmitter. I suppose if you REALLY wanted to you
could run the dual primary HV transformer on 220 VAC, however
if you did there would not be any control for the TUNE setting
of the unit.

In tune mode  there is an 11 ohm resistor placed in series with
the primary to the HV transformer only to lower the AC in to
the HV transformer.

The connector on the modulator chassis left side looking from the
rear of the unit is the main power connection. That connector, if the
unit has NOT been modified in any way, is for 115 VAC at 25 amps.

As for AC mains sagging and such, I run a separate 30 AMP 115VAC
line over to where my bc-610s reside. Then from the box located there
I have the line going to a superior (mfg) 0 - 130 VAC 25 amp variac,
which feeds the AC to the BC-610(*), only one unit at a time is ever
used.

Secondly, If the unit is working properly, and you have reasonably
good tubes in it in both the final RF stage and the modulator stage,
1 - 250TH and 2 - 100TH tubes, and you follow the tuning
procedure outlined in the manual, the RF output into a 50 ohm
load with no reflected power can be as much as 500 watts on
CW and 450 watts (carrier) on AM modes. The rigs are great
on AM phone, and with the 600 ohm audio input to the modulator
if you are using a different audio driver than the speech amp, the audio
can be quite good. The unit can be driven with a quality audio amp,
the EICO 730 modulator or the BC-614 speech amp, with good
results.

As with all things radio,
YMMV
Jim
WB2FCN
"BC-610s don't just rock, they roll!"


- Original Message -
From: "Jim Miller WB5OXQ" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Friday, April 07, 2006 7:57 PM
Subject: [AMRadio] : BC 610


> I have a friend who had one of these transmitters and we did not know what
> it really was good for.  We could not connect it to try it out because it
> seems to me it needed 220vac and we only had 110vac at his house.  I do
not
> know if it is still there but it might be.  Are these real good on am
phone?
> Does it require a carbon mic?  How much output are they good for on AM?
> This one looked to be in good condition
> WB5OXQ
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
>
>
>

RE: [AMRadio] : BC 610 needing POWER 220VAC

[John Coleman ARS WA5BXO]

I really have no idea if it is wired for 110 or 220.  I know
that the Plate XFMR is 110VAC and if it were me I would wire a separate
primary circuit for the plate XFMR.  Just for the load balance.  If the
filaments and low voltage stuff is all run from side A of a 220 circuit
and the plate XFMR from side B then it is feasible that the filaments
and low voltage supplies would be more stable.  And the pilot lamps
would not dim as much.  That is important when you're trying to write in
the log while talking on the air by the light of pilot lamps only, HIHI.


I told my wife I was going to get two 20 year olds to replace
her and she told me I was not wired for 220.

I'm gonna go disinfect some ice cubes.

John, WA5BXO 

Re: [AMRadio] : BC 610 needing POWER 220VAC

[W5OMR/Geoff]

Hi Jim,


Most big rigs run from 220VAC if for no other reason, just load
balancing.  Big rigs will often pull more that 20 amps of AC line 
current on
modulation peaks.  So to prevent the line voltage from dropping 
anymore than
is necessary, we often put the HV power supply on a separate 110VAC 
side of
a 220 circuit.  And then run the rest of the rig, and other 
paraphernalia,
from the other side.  This is call load balancing and it reduces the 
current
on the common line of the 220 service and thereby reduce power 
voltage drops

on modulation peaks.

John, WA5BXO


Jim Miller WB5OXQ wrote:

I had an idea that it draws too much current for a common 110 
circuit.  My centurion amp requires 220vac also.  Otherwise it would 
need 30 amps at 110 and that is too much for most wiring in homes.  We 
never tired to operate that transmitter and I don't know if he still 
has it but I bet he does.  He has a lot of STUFF that he never uses. 



I think ya'll are all missing the point... the BC-610 has a twist-plug 
recepticle on the back of it  the blades are curved.  If one didn't know 
better, one might think that the BC-610 used a special plug, that 
connected to 220VAC.  It does not. 

Jim, if your friend has the rig, and has the plug that goes into the 
back of it (and everything else needed for it) then yeah, you could puot 
it on 75m AM phone.  The single 250TH modulated by a pair of 100TH's was 
a military wonderment, in it's day.


--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Rick Brashear]

I may be falling into a joke or something here, but have three BC-610's 
and I have yet to run any of them on 220 vac.  All three are wired for 
115 vac as that's what was provided with the generator from which they 
were originally powered.  Both sides of the AC line entering the 
BC-610's are fused with a 25 amp fuse and I have yet to blow one, even 
when the overload protection circuit kicked out indicating an excessive 
current drain.  The two I use at this time both have an output in excess 
of 400 watts on CW and 350 watts on phone, so they are drawing full 
current from the mains.  Granted, it would sure be nice to have a 220 
vac primary on the power transformer to provide for a more stable line 
voltage, but at 115 vac I still only see about a 3 volt drop at full power.


It would be nice if the owner of the BC-610 spoken of here would put it 
on the air or if he prefers, put it on the market so it could be in 
circulation.  They are great old war horses that will be around long 
after most of us are gone.


Rick/K5IZ

Jim Miller WB5OXQ wrote:

I had an idea that it draws too much current for a common 110 
circuit.  My centurion amp requires 220vac also.  Otherwise it would 
need 30 amps at 110 and that is too much for most wiring in homes.  We 
never tired to operate that transmitter and I



Hi Jim,
Most big rigs run from 220VAC if for no other reason, just load
balancing.  Big rigs will often pull more that 20 amps of AC line 
current on...

Re: [AMRadio] : BC 610 needing POWER 220VAC

[Jim Miller WB5OXQ]

I had an idea that it draws too much current for a common 110 circuit.  My 
centurion amp requires 220vac also.  Otherwise it would need 30 amps at 110 
and that is too much for most wiring in homes.  We never tired to operate 
that transmitter and I don't know if he still has it but I bet he does.  He 
has a lot of STUFF that he never uses.
- Original Message - 
From: "John E. Coleman (ARS WA5BXO)" <[EMAIL PROTECTED]>

To: "'Discussion of AM Radio'" 
Sent: Friday, April 07, 2006 7:36 PM
Subject: RE: [AMRadio] : BC 610 needing POWER 220VAC



Hi Jim,
Most big rigs run from 220VAC if for no other reason, just load
balancing.  Big rigs will often pull more that 20 amps of AC line current 
on
modulation peaks.  So to prevent the line voltage from dropping anymore 
than
is necessary, we often put the HV power supply on a separate 110VAC side 
of

a 220 circuit.  And then run the rest of the rig, and other paraphernalia,
from the other side.  This is call load balancing and it reduces the 
current
on the common line of the 220 service and thereby reduce power voltage 
drops

on modulation peaks.

John, WA5BXO




__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb

RE: [AMRadio] : BC 610 needing POWER 220VAC

[John E. Coleman (ARS WA5BXO)]

Hi Jim,
Most big rigs run from 220VAC if for no other reason, just load
balancing.  Big rigs will often pull more that 20 amps of AC line current on
modulation peaks.  So to prevent the line voltage from dropping anymore than
is necessary, we often put the HV power supply on a separate 110VAC side of
a 220 circuit.  And then run the rest of the rig, and other paraphernalia,
from the other side.  This is call load balancing and it reduces the current
on the common line of the 220 service and thereby reduce power voltage drops
on modulation peaks. 

John, WA5BXO

[AMRadio] : BC 610

[Jim Miller WB5OXQ]

I have a friend who had one of these transmitters and we did not know what 
it really was good for.  We could not connect it to try it out because it 
seems to me it needed 220vac and we only had 110vac at his house.  I do not 
know if it is still there but it might be.  Are these real good on am phone? 
Does it require a carbon mic?  How much output are they good for on AM? 
This one looked to be in good condition
WB5OXQ 

Re: [AMRadio] BC-610(I) - What it SHOULD look like

[Rbethman]

Not for $1K + !

Bob

W5OMR/Geoff wrote:



I don't care if the rig has holes bored in the front panel, as long as 
it WORKS, then that's the -important- part.

--
-Geoff/W5OMR



--
  Bob Bethman - NØDGN
+--+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+-.oooO---Oooo.+
| () ()|
|  \  (   )  / |
|   \ _) ( _/  |
+--+
| Amateur Astronomer - Celestron Nexstar 8 - Megrez 80mm SD II |
| 12" f5 Dob coming soon!  Being built |
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--+
|ALL E-mail received and sent scanned by AVG & Norton System Works |


   

Re: [AMRadio] BC-610(I) - What it SHOULD look like

[W5OMR/Geoff]

Rbethman wrote:


Tom,

When you work one over, THAT is what it SHOULD look like!



I don't care if the rig has holes bored in the front panel, as long as 
it WORKS, then that's the -important- part.



--
-Geoff/W5OMR

[AMRadio] BC-610(I) - What it SHOULD look like

[Rbethman]

Tom,

When you work one over, THAT is what it SHOULD look like!

There is NO polishing done.  JUST cleaning!  Then you get a BC-610 that
ANYONE is proud to own and operate!

Wait until I get the pictures up for the T-213.  It was a BC-610
reworked by depot in 1959.  It was destined to be taken out to sea and
dumped overboard.  I have it AND all contents, TUs, and PA coils, that
came in the depot package.  Includes cables and speech amp.

http://home.comcast.net/~rbethman/BC-610.html

Bob

 > Bob,
 > Absolutely stunning!  Well done.
 > I also have a BC-610-I and now you've given me some motivation to get
cracking on mine and see what I can do to get 'er on the air.
 > Vy 73's,
 > -tom

[AMRadio] BC-610(I)

[Rbethman]

Look at:

http://home.comcast.net/~rbethman/BC-610.html

Bob

--
  Bob Bethman - NØDGN
+--+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+-.oooO---Oooo.+
| () ()|
|  \  (   )  / |
|   \ _) ( _/  |
+--+
| Amateur Astronomer - Celestron Nexstar 8 - Megrez 80mm SD II |
| 12" f5 Dob coming soon!  Being built |
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--+
|ALL E-mail received and sent scanned by AVG & Norton System Works |

[AMRadio] BC-610 meters

[Rick Brashear]

If anyone happens to have an abundance of panel meters like those used 
in the BC-610(*) I am in need of all three for the "I" model or actually 
any model that has the same meters.  I have some in place now, but they 
are all three different and ugly.  I'd like to get three meters that at 
least look alike if not from the same manufacturer.  They are 0-500 ma, 
0-10 vac and 0-15 ma meters.  If you have one or all and would like to 
sell them, please, contact me off list.


Thanks and 73,
Rick/K5IZ

Re: [AMRadio] BC-610 Modulator feedback - and notes

[Rbethman]

Rick,

Additionally, there should be NO shield on the 2A3s.  The entire
transmitter was designed to function with CONVECTION or OPEN air cooling.

There is only ONE tube that has a "shield".  It is the oscillator deck
6L6.  It SHOULD be a metal jacketed tube.

The 1/4 X 20 bolts on top of BC-610(X)s were intended for the mounting
of the BC-939(X) antenna tuners.  Since the BC-614(X) speech amp is
fully enclosed w/o vents, I, for one, would be very hesitant to use it
on top of the BC-610(X).  All the heat from below would add to the heat
inside the speech amp.  The components "probably" weren't designed for
THAT additional heat.  The BC-614(X) has a long enough connecting cable
to place it on the operating bench.

Pay close attention to WB2FCN, Jim!  He restored my first one.  He has
"carnal" knowledge of these BEASTS and has helped MANY get them up and
going.

I've also resent this to INCLUDE the T-368 BC-610 group, WHICH, you may 
wish to join Rick.


Bob - N0DGN

James M. Walker wrote:


I'll bet you a nickel the bias supply has a problem, the plate supply
for the 2A3s is not normal the plate supply is achieved by putting a
negative voltage on the 2A3s cathode to raise hte plate to 360 volts.

Sounds like the bias supply voltage is off. Check the manual and then
the components that provide voltage to the 2A3s
Jim
WB2FCN
YMMV

- Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Friday, March 17, 2006 6:10 PM
Subject: Re: [AMRadio] Modulator feedback


Thanks Mike.  I just made a discovery about the 2A3 A-F drivers.  I 
had a set of matched NOS RCA tubes in there.  The feedback seemed to 
be coming from the area of those tubes more so than anywhere else.  
So, I exchanged them for another pair I have and it seemed to help 
quiet the feedback. Obviously, microphonics in the 2A3's is a 
factor.  Next I looked for shields for the tubes, but have none, so I 
used a "poor man's shield", a couple of pieces of aluminum foil.  It 
helped considerably!  As a matter of fact, I could then advance the 
audio of the speech amp enough to achieve good modulation.  So, I am 
now on a quest to find some way of shielding the 2A3's.  I'm afraid 
my temporary foil shields would cause the tubes to over heat, plus 
it's not the best way of doing it.  Have you had any experience with 
this?  I wonder if the 100th's are also part of the problem.  I 
really think the "talk back" is coming from the modulation 
transformer, which I can live with.  I just have to get the feedback 
out of it.


Thanks for your assistance and advice,
Rick/K5IZ



Mike Sawyer wrote:


Rick,
   The UTC may work so don't discount it. Those I and H model 
transformers were only about half the size as the D and E models. I 
can't think of the company that made them but they were 
substantially different then the earlier models. As always, your 
mileage may vary.

Mod-U-Lator,
Mike(y)
W3SLK





__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb






__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb



--
Bob - NØDGN
  Bob Bethman - NØDGN
  \\"""//\\"""//
   (@ @)  (@ @)
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
|   

Re: [AMRadio] BC-610 Modulator feedback - and notes

[Rbethman]

Rick,

Additionally, there should be NO shield on the 2A3s.  The entire 
transmitter was designed to function with CONVECTION or OPEN air cooling.


There is only ONE tube that has a "shield".  It is the oscillator deck 
6L6.  It SHOULD be a metal jacketed tube.


The 1/4 X 20 bolts on top of BC-610(X)s were intended for the mounting 
of the BC-939(X) antenna tuners.  Since the BC-614(X) speech amp is 
fully enclosed w/o vents, I, for one, would be very hesitant to use it 
on top of the BC-610(X).  All the heat from below would add to the heat 
inside the speech amp.  The components "probably" weren't designed for 
THAT additional heat.  The BC-614(X) has a long enough connecting cable 
to place it on the operating bench.


Pay close attention to WB2FCN, Jim!  He restored my first one.  He has 
"carnal" knowledge of these BEASTS and has helped MANY get them up and 
going.


Bob - N0DGN

James M. Walker wrote:


I'll bet you a nickel the bias supply has a problem, the plate supply
for the 2A3s is not normal the plate supply is achieved by putting a
negative voltage on the 2A3s cathode to raise hte plate to 360 volts.

Sounds like the bias supply voltage is off. Check the manual and then
the components that provide voltage to the 2A3s
Jim
WB2FCN
YMMV

- Original Message - From: "Rick Brashear" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Friday, March 17, 2006 6:10 PM
Subject: Re: [AMRadio] Modulator feedback


Thanks Mike.  I just made a discovery about the 2A3 A-F drivers.  I 
had a set of matched NOS RCA tubes in there.  The feedback seemed to 
be coming from the area of those tubes more so than anywhere else.  
So, I exchanged them for another pair I have and it seemed to help 
quiet the feedback. Obviously, microphonics in the 2A3's is a 
factor.  Next I looked for shields for the tubes, but have none, so I 
used a "poor man's shield", a couple of pieces of aluminum foil.  It 
helped considerably!  As a matter of fact, I could then advance the 
audio of the speech amp enough to achieve good modulation.  So, I am 
now on a quest to find some way of shielding the 2A3's.  I'm afraid 
my temporary foil shields would cause the tubes to over heat, plus 
it's not the best way of doing it.  Have you had any experience with 
this?  I wonder if the 100th's are also part of the problem.  I 
really think the "talk back" is coming from the modulation 
transformer, which I can live with.  I just have to get the feedback 
out of it.


Thanks for your assistance and advice,
Rick/K5IZ



Mike Sawyer wrote:


Rick,
   The UTC may work so don't discount it. Those I and H model 
transformers were only about half the size as the D and E models. I 
can't think of the company that made them but they were 
substantially different then the earlier models. As always, your 
mileage may vary.

Mod-U-Lator,
Mike(y)
W3SLK





__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb






__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb



--
Bob - NØDGN
  Bob Bethman - NØDGN
  \\"""//\\"""//
   (@ @)  (@ @)

+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I 1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
| 

Re: [AMRadio] BC-610 terminating impedance

[W5OMR/Geoff]

For anyone interested, there are some pretty good and descriptive 
pictures of a BC-610 E model at


http://w5omr.shacknet.nu:81/~w5omr/hamstuff/AM-Stuff/BC-610/


---
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] BC-610 terminating impedance

[Barrie Smith]

Barrie,

There ARE different tube line-ups between the HT-5 and the BC-614.


I did not know that!  Will have to do some research.


From your description of the mounting for the shelf and socket for the 
padder cap, there are obviously differences inside the BC-610 vs. the 
HT-4.


I went to the previously suggested website.  There was a photo of the RF 
compartment of a BC-610 with no capacitor shelf in sight.


I'm curious as to what differences in meters there is.  I have one for 
filament voltage, one for tweaking the oscillator - it is multi-functional 
with a function switch, and then there is the plate current meter.  The 
BC-614 has of course its own meter for modulation current.  The BC-939 has 
an RF Ammeter.


The HT4-B has five meters.  From left to right they are:

Plate
Grid Current
Excitation Plate
Fil Voltage
Modulation Plate
(I believe that this meter performs the same function as the modulation 
meter in the BC-614.  At least they dance about in the same fashion when I 
babble into the microphone)


What other differences there may be, I do not know.  It would be of interest 
(to me, at least) to find out.


BTW, there is a fairly decent photo of my HT4-B on the November, 1992 (I 
think) cover of Electric Radio magazine.  My call sign, at that time was 
KF7VA.  Thanks to the vanity program, I'm back to my original call from the 
early 1950s.


73, Barrie, W7ALW


Bob - N0DGN

Barrie Smith wrote:


Bob:

I've got my HT4-B working FB, for many years.

I own a BC-939, but I've never attempted to use it.

I have the BC-614 speech amp, and this is what I've been using.  The only 
reason I'd like to have the HT5 is that it's what was originally used 
with the rig.


My questions regarding the HT4-B are mostly motivated by the possibility 
that there are some differences between it and the BC-610.


There are cosmetic differences, and the HT4 has one more meter.  And, 
possibly, the shelf with the socket for the air-padder cap.


73, Barrie, W7ALW



--
Bob - NØDGN

+--+
|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I,1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+



__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami
---
[This E-mail scanned for viruses by Declude EVA]






---
[This E-mail scanned for viruses by Declude EVA]

Re: [AMRadio] BC-610 terminating impedance

[Rbethman]

Barrie,

There ARE different tube line-ups between the HT-5 and the BC-614.

From your description of the mounting for the shelf and socket for the 
padder cap, there are obviously differences inside the BC-610 vs. the HT-4.


I'm curious as to what differences in meters there is.  I have one for 
filament voltage, one for tweaking the oscillator - it is 
multi-functional with a function switch, and then there is the plate 
current meter.  The BC-614 has of course its own meter for modulation 
current.  The BC-939 has an RF Ammeter.


Bob - N0DGN

Barrie Smith wrote:


Bob:

I've got my HT4-B working FB, for many years.

I own a BC-939, but I've never attempted to use it.

I have the BC-614 speech amp, and this is what I've been using.  The 
only reason I'd like to have the HT5 is that it's what was originally 
used with the rig.


My questions regarding the HT4-B are mostly motivated by the 
possibility that there are some differences between it and the BC-610.


There are cosmetic differences, and the HT4 has one more meter.  And, 
possibly, the shelf with the socket for the air-padder cap.


73, Barrie, W7ALW



--
Bob - NØDGN
  
+--+

|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I,1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   |
+--+
|   Opinions expressed are that of my own and do not necessarily   |
| coincide with or represent those of ANYONE else  |
+--.oooO---Oooo.---+
|  () ()   |
|   \  (   )  /|
|\ _) ( _/ |
|ALL E-mail received and sent scanned by AVG & Norton System Works |
+--+


   

Re: [AMRadio] BC-610 terminating impedance

[Barrie Smith]

Bob:

I've got my HT4-B working FB, for many years.

I own a BC-939, but I've never attempted to use it.

I have the BC-614 speech amp, and this is what I've been using.  The only 
reason I'd like to have the HT5 is that it's what was originally used with 
the rig.


My questions regarding the HT4-B are mostly motivated by the possibility 
that there are some differences between it and the BC-610.


There are cosmetic differences, and the HT4 has one more meter.  And, 
possibly, the shelf with the socket for the air-padder cap.


73, Barrie, W7ALW 



---
[This E-mail scanned for viruses by Declude EVA]

Re: [AMRadio] BC-610 terminating impedance

[rbethman]

Barrie,

Download a copy of the manual, TM 11-286.

This can be gotten from:

http://eshop1.chem.buffalo.edu/Beastly-610.html

This is WB2FCNs web site.

The area you want to look at in the TM starts around page 43.

In the Military versions of the HT-4, (BC-610s), there are what looks like HV 
fuse clips on the top of the final loading cap.  Depending which loading coil 
is used, either C-455 or C-454, dictates whether you use a 55uuf or a 100 uuf 
vacuum capacitor.

If I had spares, I'd hook up with you and we'd talk.  Unfortunately I do NOT.

There are OTHER changes that MUST be made to the TX - OR - damage can occur.  
These are some MINOR rewiring that are COMPLETELY reversible!

If you own and use a BC-939 tuner, it ALSO must have some rewiring done, and 
use of another one or two vacuum caps are used.  With the BC-939, the "long 
wire" specified for operations from 1Mc to 2 Mc is 125 ft.

As to the HT-5 speech amplifier, I strongly suspect that a BC-614 speech amp 
CAN be used in lieu of the HT-5.  Watch that "E" place for them to turn up.  
They do from time to time.

The other place to go would be the T-368 BC-610 mail list through QTH.NET.  
Join the list and meet some other owners of the BEASTS!

Bob - N0DGN


> With all this interesting discussion about the BC-610 I'm reminded of a 
> question I asked a while ago regarding the padder-cap for 160 operation.
> 
> I do not have a BC-610, nor, other than photos, have I ever seen one.  I do 
> have the Hallicrafters HT4-B, which was made in 1938, and was the basis for 
> the BC-610.
> 
> In the HT4-B, there is a platform in the rear left corner of the RF 
> compartment with four banana jacks.  These jacks are hard-wired in such a 
> fashion that if a capacitor were plugged into two of the jacks it would be 
> in parallel with the variable tune cap.
> 
> I was told, years ago on the air, that this assembly was to be used for a 
> plugin fixed air capacitor for low frequency operation.
> 
> I use a 50pf vacuum cap for 160 operation, but I'd certainly like to know 
> more about the plugin air cap.  And, if any still exist, because I'd 
> certainly be in the market for one.
> 
> Also, I'm still looking for the HT5 speech amp.
> 
> TNX,
> 
> Barrie, W7ALW 
> 
> 
> ---
> [This E-mail scanned for viruses by Declude EVA]
> 
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 terminating impedance

[Barrie Smith]

With all this interesting discussion about the BC-610 I'm reminded of a 
question I asked a while ago regarding the padder-cap for 160 operation.


I do not have a BC-610, nor, other than photos, have I ever seen one.  I do 
have the Hallicrafters HT4-B, which was made in 1938, and was the basis for 
the BC-610.


In the HT4-B, there is a platform in the rear left corner of the RF 
compartment with four banana jacks.  These jacks are hard-wired in such a 
fashion that if a capacitor were plugged into two of the jacks it would be 
in parallel with the variable tune cap.


I was told, years ago on the air, that this assembly was to be used for a 
plugin fixed air capacitor for low frequency operation.


I use a 50pf vacuum cap for 160 operation, but I'd certainly like to know 
more about the plugin air cap.  And, if any still exist, because I'd 
certainly be in the market for one.


Also, I'm still looking for the HT5 speech amp.

TNX,

Barrie, W7ALW 



---
[This E-mail scanned for viruses by Declude EVA]

RE: [AMRadio] BC-610 terminating impedance

[rbethman]

The biggest difference with the link in the BC-610s, is that the link is on a 
pivot joint that is fixed on the center line of the loading coil.  You can 
rotate the link from vertical and in line with the turns, OR you can place it 
perpendicular to the turns AND anywhere in between.

You CANNOT take the link outside the coil proper.

This vastly limits the variability of load impedances.

I do not know when the fixed link coils ceased to be issued.  However, the 1952 
manual shows the issued coils to ALL be the rotating link variety.

The "animals" or as most refer to them, "Beasts", are indeed a horse of a 
different color.

The A, B, C, & D variants have different manuals - AND - may well have 
different characteristics.  The E, F, G, H, I, and T-213 manual was published 
in October 1952.  

My I variant is indeed a Hallicrafters manufactured one.  So noted by data 
plate and Hallicrafters logo on the tuning units.

I believe my T-213 is a B&W manufactured one.

Both came with an SO-239 output connector.  The I model also has the porcelain 
feedthroughs.  When looking inside, I find the lines to the feedthroughs ALSO 
go with one to ground and the other to the center conductor of the SO-239.

As to polarization of antennas, there is no question that long haul propogation 
DOES constantly change.

My point was the use of the Mil issue 25ft vertical whip.  As it has a very 
short length, its capture ability and transmission ability would be severely 
degraded in comparison with a manufactured Ham vertical.  That was my basis for 
saying that I had no use for a "vertical" to be installed off the back of the 
BC-939.

I have consistently used dipoles and inverted vees for my station.  I have had 
no issues, and have been very happy with the results qith QSOs up and down the 
entire East Coast, and well into the MidWest.

Antennas ARE the only black art left.  I have always found them to interesting.

As to my reference to the VSWR/SWR, I was explaining the reading into a 50 ohm 
dummy load that is internal to the ME-165G - NOT into a feedline.  I feel very 
comfortable that the reading I referred to was indeed indicating that the 
transmitter WAS indicating a 50 ohm unbalanced output.

Sorry - but I am NOT putting my antenna bridge looking back into the 
transmitter.  I like my bridge, and am NOT looking to allow ALL of its "smoke" 
to depart.

The manual for these two radios ALSO states to connect the transmitter to the 
BC-939 tuner by COAXIAL cable.

Bob - N0DGN


> 
> 
> 
>   I may have missed something here amongst all the messages and I
> really am not too familiar with the BC610 but I thought it had variable
> loading with an adjustable 3-4 turn link.  If so, it should be able to
> load into a fairly wide range of loads.  On my variable link rig I can
> go down to about 10 ohms load by pulling the link out to maintain the
> proper plate current, but with the link in all the way the proper
> loading (indicated by plate current)is reached when the load is about
> 100 ohms.  Of course if the load is 10 ohms and the link pulled out for
> proper plate current I need to be very careful not to pour the coals on
> with the plate voltage or the link will over heat.  I have been able to
> load to proper plate current with a 300 ohm load but I had to parallel
> tune my link instead of series tune.  
> 

Re: [AMRadio] BC-610 terminating impedance

[W5OMR/Geoff]

John Coleman ARS WA5BXO wrote:



I may have missed something here amongst all the messages and I
really am not too familiar with the BC610 but I thought it had variable
loading with an adjustable 3-4 turn link.  



It does.

For anyone interested in what an 80m BC-610 tank coil looks like,
http://w5omr.shacknet.nu:81/~w5omr/hamstuff/AM-Stuff/BC-610/tank-coil.jpg

---
73 = Best Regards,
-Geoff/W5OMR

RE: [AMRadio] BC-610 terminating impedance

[John Coleman ARS WA5BXO]

I may have missed something here amongst all the messages and I
really am not too familiar with the BC610 but I thought it had variable
loading with an adjustable 3-4 turn link.  If so, it should be able to
load into a fairly wide range of loads.  On my variable link rig I can
go down to about 10 ohms load by pulling the link out to maintain the
proper plate current, but with the link in all the way the proper
loading (indicated by plate current)is reached when the load is about
100 ohms.  Of course if the load is 10 ohms and the link pulled out for
proper plate current I need to be very careful not to pour the coals on
with the plate voltage or the link will over heat.  I have been able to
load to proper plate current with a 300 ohm load but I had to parallel
tune my link instead of series tune.  

As for SWR bridges, I think many people get the properties of
loads and sources mixed up.  All the SWR meters I have measure the match
between the line and the load and they don't give a hoot about the
source as long as there is no reactance in the line from the source.

SWR is defined as the ratio of transmission line to load.  Not
source to line.  

Given the scenario of a XMITER (say 100 watts) that has been
adjusted to match a 50 ohm dummy load on a 1/2 wave length of coax cable
and the SWR meter is at the load end of the cable.  If the load
resistance is increase to 100 ohms the SWR meter should show 2:1 and the
transmitter should have 1/2 output RF current, Hence 1/2 power.  If the
transmitters load is adjusted to compensate and bring the RF current and
plate current back up to normal it will be putting out 100 watts again.
But the SWR meter should still show 2:1.  The 100 ohm load will get all
must a hot as the 50 ohm load and in many cases you will not be able to
tell the difference in temperature.  If there is a slight difference it
will be caused by the slight increase in loss of the transmission line
due to the SWR of 2:1.  This is generally not of any consequence on 80
or 40 meters.  For the most part the load is still getting the 100 watts
even though it is 100 ohms instead of 50 ohms.

By the same token many SWR meters that are not at the load end
of the cable may not give the correct reading and especially if the
source is not a resistive output as most transmitters are not unless
they or pre adjusted with the desired load attached with a very short
cable.

The reason I said a 1/2 wave length of coax in the above
scenario, is because that with a 1/2 wave length (must take in effect of
slow velocity of coax) the value of load resistance is reflected at the
source.  At a 1/4 wave length is either multiplied of divided by the SWR
depending on whether the load is greater that the line characteristic
impedance or less than it.

Of course if the SWR is 1:1 then it doesn't matter how long the
line is or where you measure it.

The only need I have found for an SWR meter is, as an indicator
of the tuning of an antenna tuner for random length wire or balanced
line doublets.  Also many solid state radios have no tuning built in and
can only work right into a 50 ohm non reactive load.  In this case a PI
type tuner for coax fed antennas is very useful for fine tuning to the
proper load. (Basically, it takes the place of an internal tune and load
procedure, as older tube type radios had.)  The SWR meter is a good
indicator to use when it is placed at the input of the tuner and the
transmitter has been pre-tuned into a 50 ohm dummy load.  When the
antenna tuner is adjusted correctly, as indicated by the SWR meter, the
transmitter will be loaded just as it was with the dummy load and will
not have to be retuned.

SEE http://www.qsl.net/wa5bxo/swr/swr.htm

John,
WA5BXO



  
  

Re: [AMRadio] BC-610 terminating impedance

[Barrie Smith]

This has been an interesting thread, and I learned some things about the 
HT4-B/BC-610.


Relative to the polarization issue:  I read a rather long article quite a 
few years ago about a ham who was also an electronics professor at a 
university in Italy, I believe.


He set up two separate antennas, one vertical and one horizontal, feeding 
two separate receivers, and fed the IF output of one of the RX to the 
vertical plates of an O'scope, and the other RX to the horizontal plates.


With each receiver tuned to the same frequency, he could watch the relative 
signal strength of the vertical or horizontal polorization on the 'scope.


While I don't remember all the details, I do remember that when skip was 
involved the polorization of the incoming signal varied considerably, and 
the most likely polorization was a combination of both, which was a 45 
degree angle trace on the scope.


I think that cross-polorization only really matters on line-of-sight 
signals.


73, Barrie, W7ALW 



---
[This E-mail scanned for viruses by Declude EVA]

Re: [AMRadio] BC-610 terminating impedance

[Jim Wilhite]

- Original Message - 
From: "Jim Candela" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "Discussion of AM Radio" 


Sent: Saturday, October 29, 2005 9:39 AM
Subject: Re: [AMRadio] BC-610 terminating impedance



Bob Wrote:
>
Now about that polarization issue you mentioned. I had
long in depth conversations with the late Ozona Bob,
W5PYT concerning this. What I recall is that when
receiving skip at HF, the polarization is constantly
changing, and the QSB you experience is in part due to
that. The other part is vector addition & subtraction
from picking up the same signal from different paths,
phase, and time delay. Bob figured that if he
transmitted circular polarization this would in effect
reduce QSB at the receiving end. I recall he had huge
diagonally mounted turnstile dipoles mounted nearly a
football field high (the top). At my QTH (Austin), he
was always on the S-meter peg, and NO QSB. That was a
distance of 250 miles, day and night.

I myself would be hesitant to put up a 80 meter
vertical because my buddies close in within Texas
would have trouble hearing me if they were beyond
groundwave distance, and before the first hop
distance.

Now how does KC9VF get out so well? Doesn't he have a
vertical dipole on 80 meters?

For skip reception, it seems that the transmitted
polarization, isn't a big issue, but more of a angle
of radiation issue.

Regards,
Jim Candela
WD5KJKO



Jim did you ever visit Bob, W5PYT at his shack?  I was there once a few 
years before he died.  I missed him but went out to where the transmitter 
was located in an old abandoned microwave transmitter site.  I would guess 
the tower to be about 300 ft. high and so many wires hanging from it a bird 
could not fly within 1/4 mile of it.


I didn't see a turnstile, but I would have challenged anyone to spot any of 
antenna in that grouping.  As for Marv., his antenna is a 193 ft.tower 
installed like a broadcast antenna.  He operated it for a while without 
radials until he could find time to install them.  The only difference in 
his signal then and now with the radials, is he is a bit louder at my QTH 
but not a lot.  I always hear his signal and if I loose him, I loose signals 
from stations equidistant that use dipoles.


I have a friend that says the antennas are the only black art left.  You 
calculate what it will do then install it.  Then you set about making it 
work.  I tend to agree with that logic.  One thing I am convinced about is 
put up a dipole rather than a Vee.  The mismatch is minimal but you get the 
voltage points up in the air.  In that case the ends do not tend to induct 
into the ground or surrounding structures, natural or manmade.


I know many people will disagree and use some magic antenna modeling 
calculator to prove me wrong, but I get consistently better signals reports 
using a dipole at 40 ft. than with a Vee at 55 ft.  In Marv's case he has 
more tower (wire) in the air therefore more capture/radiation area.  And he 
also has a good ground system.


At the lower frequencies of BCB you see a lot of stations that you hear day 
and night and the low angle radiation tends to extend the coverage at night, 
but there are still lobes that will cover closer in.  I had a vertical in 
Wyoming and was able to work the same stations at nigh that I did in the 
daytime.  I only had 4 quarter wave radials under it.  My signal was not as 
strong at night, but I still had "local" coverage with a good enough signal.


I know I am opening a can of worms since so much of this theory depends on 
your installation so let the guessing begin.


73  Jim
W5JO 

Re: [AMRadio] BC-610 terminating impedance

[k0ng]

Well said Jim !! There is only one antenna that works well at any given
moment and that is the one that does (work well) if you are lucky.

73, Charlie, K0NG.

Quoting Jim Candela <[EMAIL PROTECTED]>:

> Bob Wrote:
>
> >Of course I have not pursued a whip installation.  It
> >would seem to be a useless endeavor as the 160, 80,
> 40, >and 20 meter bands are "normally" of horizontal
> >polarization.  I see no logic in operating in cross
> >polarization, and making communications more
> difficult >than necessary.
>
> Hi Bob, I enjoyed your BC-610 thread. It makes me wish
> I had obtained one back when I had several chances. I
> recall a story from Dave, W6PSS when he was moving his
> three 610's in a trailer, and was involved in a bad
> traffic accident. He was OK, but the 610's did not
> fare well.
>
> Now about that polarization issue you mentioned. I had
> long in depth conversations with the late Ozona Bob,
> W5PYT concerning this. What I recall is that when
> receiving skip at HF, the polarization is constantly
> changing, and the QSB you experience is in part due to
> that. The other part is vector addition & subtraction
> from picking up the same signal from different paths,
> phase, and time delay. Bob figured that if he
> transmitted circular polarization this would in effect
> reduce QSB at the receiving end. I recall he had huge
> diagonally mounted turnstile dipoles mounted nearly a
> football field high (the top). At my QTH (Austin), he
> was always on the S-meter peg, and NO QSB. That was a
> distance of 250 miles, day and night.
>
> I myself would be hesitant to put up a 80 meter
> vertical because my buddies close in within Texas
> would have trouble hearing me if they were beyond
> groundwave distance, and before the first hop
> distance.
>
> Now how does KC9VF get out so well? Doesn't he have a
> vertical dipole on 80 meters?
>
> For skip reception, it seems that the transmitted
> polarization, isn't a big issue, but more of a angle
> of radiation issue.
>
> Regards,
> Jim Candela
> WD5KJKO
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>





This message was sent using IMP, the Internet Messaging Program.

Re: [AMRadio] BC-610 terminating impedance

[Jim Candela]

Bob Wrote:

>Of course I have not pursued a whip installation.  It
>would seem to be a useless endeavor as the 160, 80,
40, >and 20 meter bands are "normally" of horizontal
>polarization.  I see no logic in operating in cross 
>polarization, and making communications more
difficult >than necessary.

Hi Bob, I enjoyed your BC-610 thread. It makes me wish
I had obtained one back when I had several chances. I
recall a story from Dave, W6PSS when he was moving his
three 610's in a trailer, and was involved in a bad
traffic accident. He was OK, but the 610's did not
fare well.

Now about that polarization issue you mentioned. I had
long in depth conversations with the late Ozona Bob,
W5PYT concerning this. What I recall is that when
receiving skip at HF, the polarization is constantly
changing, and the QSB you experience is in part due to
that. The other part is vector addition & subtraction
from picking up the same signal from different paths,
phase, and time delay. Bob figured that if he
transmitted circular polarization this would in effect
reduce QSB at the receiving end. I recall he had huge
diagonally mounted turnstile dipoles mounted nearly a
football field high (the top). At my QTH (Austin), he
was always on the S-meter peg, and NO QSB. That was a
distance of 250 miles, day and night.

I myself would be hesitant to put up a 80 meter
vertical because my buddies close in within Texas
would have trouble hearing me if they were beyond
groundwave distance, and before the first hop
distance.

Now how does KC9VF get out so well? Doesn't he have a
vertical dipole on 80 meters? 

For skip reception, it seems that the transmitted
polarization, isn't a big issue, but more of a angle
of radiation issue.

Regards,
Jim Candela
WD5KJKO

[AMRadio] BC-610 terminating impedance

[Rbethman]

The standard connection from the porcelain insulated connections to the 
BC-939 is INDEED 50 ohm coaxial cable.


Those desiring to ELIMINATE TVI issues would NORMALLY install a Low-Pass 
filter in-line between the BC-610 and the BC-939 which is already 
internally wired with 50 ohm coaxial cable.


I also place the ME-165G in-line PRIOR to the BC-939 or the proper 
dipole.  My BC-610 location does not allow for a "wire" exiting from the 
BC-939 to the outside.  So it is coax to the outside.


I ALSO own a T-213, an overhauled BC-610 by depot, in August 1959.  One 
of the changes from BC-610 to T-213, was to remove the porcelain 
insulators and replace ONE with an SO-239.  I can find NO internal final 
circuit mods other than this, and the schematics agree with this assessment.


As Geoff/W5MOR has indicated from his operations, I TOO have had ONE and 
ONLY one gripe about getting into a CHEAP "portable" telephone since 
2000.  I provided the individual with the necessary information to 
contact the phone company to have a filter put in place.  He has NOT 
returned or complained again.


There is NO question that the output of the BC-610 series, my first one 
happens to be an (I) model, is indeed 50 ohms impedance.  It is 
unfortunate that some hams make the ASSUMPTION that since it has 
porcelain insulators for the output, that it is a balanced output of 
OTHER than 50 ohms.


I cannot stress the importance of obtaining the manual, carefully 
studying it, and pay close attention to the details.  The ME-165G is 
unquestionably a 50 ohm input SWR/Wattmeter/dummy load.  It comes with 
"N" connectors for input and output.


Don is ABSOLUTELY correct!

The use of 44ft and 77ft "wires, AND the use of the "term" long wire, is 
the military's AND the manufacturer's.  If you are going to use a dipole 
do NOT use the BC-939!  It's intent was for the specified wire lengths 
and/or the issued whip antenna.


Of course I have not pursued a whip installation.  It would seem to be a 
useless endeavor as the 160, 80, 40, and 20 meter bands are "normally" 
of horizontal polarization.  I see no logic in operating in cross 
polarization, and making communications more difficult than necessary.


Bob - N0DGN

Donald Chester wrote:

The final is single-ended, but the plate tank circuit is balanced just 
as in a pushpull amplifier.  This is the classic plate-neutralised 
triode final.  The other half of the coil functions to generate the 
out-of-phase rf voltage required to neutralise the circuit.  True, the 
tube works into only half the coil, but the circulating current of the 
resonant tank circuit is present in the entire coil, which along with 
the split-stator variable tank capacitor make up the tuned circuit.  
The Q of the tank is determined by the LC ratio of the entire coil and 
capaciter.


The circuit is inherently balanced.  The flywheel effect of the tank 
circuit takes care of the fact that the rf pulses are introduced on 
only one end of the coil.  The link output on the BC-610 came from the 
factory balanced, with two ceramic insulators at the output.  I have 
seen many of these converted to an unbalance output by grounding one 
side to the cabinet and using a SO-239.  But the link in the middle of 
the tank coil is inherently a balanced output.


Don K4KYV




--
Bob - NØDGN
  
+--+

|  \\"""//\\"""//  |
|   (@ @)   Bob Bethman - NØDGN(@ @)   |
+---oOOo-(_)-oOOo--oOOo-(_)-oOOo---+
| NØDGN AMRadio Manassas, VA|REAL Tube Radio and AM|
+---+--+
|   Manassas Radio - Home of Homemade Kielbasa & Pirogi|
+---+--+
| Bob Bethman\\\|/// " The absence of a danger |
| rbethman(at)comcast.net   \\ ~ ~ //  signal does *NOT* mean  |
|   (/ @ @ /)  that everything is OK " |
+-oOOo-(_)-oOOo+
|   |
| 1 BC-61ØI w/BC-614I,1 T-213/GRC-26 w/BC614I,1 '51 Collins R-390A |
|  SP-600/NR Type 159, Heath DX-60, Apache, Mohawk, SX-101, HT-32A |
+---.oooO---Oooo.---.oooO---Oooo.--+
|   () ()   () ()  |
|\  (   )  / \  (   )  /   |
| \ _) ( _/   \ _) ( _/|
+--+
|   Amateur Astronomer - Celestron Nexstar 8   |
| 12" f5 Dob coming soon!  Being built |
|  Meade ETX-6Ø|
|   38 Deg 46'48.62"' N - 77 Deg 28'26.89" W   

RE: [AMRadio] BC-610 down=up and burnt't finals

[Donald Chester]

I just remembered a funny situation where Otis, K5SWK, had some one else at
his rig controls. The rig was and is single 833 modulated by a pair and 
this
story was of many years ago.  The person at the controls is now a silent 
key

but I still won't mention his name.   The story goes that Otis was down the
street buying cigarettes, beer or something, and this person was visiting
from out of town.  Not realizing the rig had had a arc over on the tuning
capacitor, that is never experiencing anything of that size before, the
operator continued to talk while the big pole pegs melted the plate of the
833 in the final.  The 833 had a hole burnt through the plate the size of a
half dollar after the circuit breaker on the house when pop.  The funny 
part

of this story is that that tube was a very good tube and continued to work
perfectly with out even a drop in grid current at full output.  I ask Otis
if the tube showed any color and he said that he could not see the other
side but that on the side facing him there was no place for the tube to 
show

color.  He did change the tube later because he said that it was just too
weird to look at the grid and heater through the hole and not see the 
normal

little red glow that was supposed to be there on the plate.


Some of those 833A's are indestructible.  I have one with a shiny spot the 
size of a silver dollar burnt into the plate, and the glass got so hot that 
it softened and the vacuum began to suck in the envelope.  There is a huge 
dimple on one side of the glass envelope.  Someone gave it to me with some 
other junk, and before throwing it out I decided to test in in the Gates 
broadcast transmitter.  Turns out to be one of the best 833A's in my 
collection.  Works as well as a brand new tube.


Don K4KYV

Re: [AMRadio] BC-610 down=up

[Donald Chester]

So I was half correct. But it is indeed an unbalanced system. I was
recalling about an article done back in '94 in an issue of Electric Radio
which stated that the final only utilized half the coil.


The final is single-ended, but the plate tank circuit is balanced just as in 
a pushpull amplifier.  This is the classic plate-neutralised triode final.  
The other half of the coil functions to generate the out-of-phase rf voltage 
required to neutralise the circuit.  True, the tube works into only half the 
coil, but the circulating current of the resonant tank circuit is present in 
the entire coil, which along with the split-stator variable tank capacitor 
make up the tuned circuit.  The Q of the tank is determined by the LC ratio 
of the entire coil and capaciter.


The circuit is inherently balanced.  The flywheel effect of the tank circuit 
takes care of the fact that the rf pulses are introduced on only one end of 
the coil.  The link output on the BC-610 came from the factory balanced, 
with two ceramic insulators at the output.  I have seen many of these 
converted to an unbalance output by grounding one side to the cabinet and 
using a SO-239.  But the link in the middle of the tank coil is inherently a 
balanced output.


Don K4KYV

Re: [AMRadio] BC-610 down=up

[Mike Sawyer]

So I was half correct. But it is indeed an unbalanced system. I was 
recalling about an article done back in '94 in an issue of Electric Radio 
which stated that the final only utilized half the coil. Of course that was 
a while ago.
Mike(y)
W3SLK
- Original Message - 
From: "James M. Walker" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Thursday, October 27, 2005 11:55 AM
Subject: Re: [AMRadio] BC-610 down=up


Check the schematic for the BC-610

Jim
WB2FCN

- Original Message -
From: "Mike Sawyer" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 9:34 PM
Subject: Re: [AMRadio] BC-610 down=up


> The BC-610 has an un-balanced output. Generally, had it been 'push-pull',
it
> would have been with a balanced output. In essence, it only utilizes half
> the coil on the jack bar. I just had this very same conversation not too
> long ago.
> Mike(y)
> W3SLK
> - Original Message -
> From: "Barrie Smith" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Wednesday, October 26, 2005 8:47 PM
> Subject: Re: [AMRadio] BC-610 down=up
>
>
> Just curious, here.
>
> Someone mentioned that the BC-610 has a 50 ohm output.  Well, I don't
> remember ever having seen a BC-610, but I do have an HT4-B (the civilian
> version of the BC-610, made in 1938), which does not (in stock form, at
> least) have a 50 ohm output, it has a balanced output.
>
> So, I may be talking about, and giving advice about, something else.
>
> 73, Barrie, W7ALW
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
>
>


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami 

Re: [AMRadio] BC-610 down=up

[W5OMR/Geoff]

James M. Walker wrote:


Check the schematic for the BC-610

Jim
WB2FCN



If anyone needs/wants to look at one, I have the E version at
http://w5omr.shacknet.nu:81/~w5omr/hamstuff/AM-Stuff/BC-610/bc610.gif

It's not the best, but it's not -that- bad.

--
73 = Best Regards,
-Geoff/W5OMR

Re: [AMRadio] BC-610 down=up

[James M. Walker]

Check the schematic for the BC-610

Jim
WB2FCN

- Original Message -
From: "Mike Sawyer" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 9:34 PM
Subject: Re: [AMRadio] BC-610 down=up


> The BC-610 has an un-balanced output. Generally, had it been 'push-pull',
it
> would have been with a balanced output. In essence, it only utilizes half
> the coil on the jack bar. I just had this very same conversation not too
> long ago.
> Mike(y)
> W3SLK
> - Original Message -
> From: "Barrie Smith" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Wednesday, October 26, 2005 8:47 PM
> Subject: Re: [AMRadio] BC-610 down=up
>
>
> Just curious, here.
>
> Someone mentioned that the BC-610 has a 50 ohm output.  Well, I don't
> remember ever having seen a BC-610, but I do have an HT4-B (the civilian
> version of the BC-610, made in 1938), which does not (in stock form, at
> least) have a 50 ohm output, it has a balanced output.
>
> So, I may be talking about, and giving advice about, something else.
>
> 73, Barrie, W7ALW
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
>
>

Re: [AMRadio] BC-610 down=up

[James M. Walker]

Well Mike and group,
The coupler itself doesn't generate TVI! The transmitter that is connected
to
it might, the coupler just pass along the signals that go to it.

The "coupler" was never intended to , tune a dipole antenna, nor an
open wire fed antenna. It was for a base fed "Whip" antenna and the
manual for the SCR-399/499 called out the length of the feed cable
to the base of the whip, and also the length of the whip. If you followed
the manual and provided those lengths, AND also if stationary, provided
the ground system suggested, the coupler worked as intended. As in it
put most if not all of the RF into the wire.

I think most of the stories about generating TVI are bogus, or at least
leaving out all the information about the type of antenna that was being
used. To ease the pain of not knowing about the usage, anyone wanting
to use the BC-939(*), or the TN-339(*) coupler should first read the
manuals for those units.

I have learned that any "hunk" of wire will radiate, if you get the RF to
it.
These units provide the means for that, but they require that the guide
lines for usage be followed.

Jim
WB2FCN

- Original Message -
From: "Mike Sawyer" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 4:28 PM
Subject: Re: [AMRadio] BC-610 down=up


> The way I understand is that the BC-939 was a helluva TVI generator. What
is
> neat is that they used the exact same thing for the BC-610's younger
> brother, the T-368. Only difference is they put it in a battleship grey
box.
> Mike(y)
> W3SLK
>
> - Original Message -
> From: "Todd, KA1KAQ" <[EMAIL PROTECTED]>
> To: "Discussion of AM Radio" 
> Sent: Wednesday, October 26, 2005 9:23 AM
> Subject: Re: [AMRadio] BC-610 down=up
>
>
> On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >
> > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:
> >
> > > Actually,
> > > The BC-939 (*) handles an end fed long wire, the recommended length
for
> > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters
and
> > > works quite well.
> > >
> > Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18
> > MHz.
> >   The term is usually used to describe wires measured in wavelengths as
> > opposed to feet and inches, see various ARRL and other antenna books.
>
> Apparently Hallicrafters and/or the military considered it long enough
> to qualify since the 3 position switch on front of the tuner has 'long
> wire' specifically listed in the center position. My guess is that
> they considered any random length beyond what would qualify as a
> 'whip' to be a long wire, perhaps in the spirit of the original term.
>
> The odd thing about my A model is that the lower vacuum cap has been
> removed and replaced with an air capacitor, screwed to the base with
> heavy wire soldered to each of the two clips. It resembles a moderate
> sized air variable but with only 5-6 stationary plates. Looks to
> either be factory installed or later upgraded. Haven't had time yet to
> investigate the value or rating.
>
> Very well-built piece of equipment, even if it has limited utility.
>
> ~ Todd/'Boomer'  KA1KAQ
>
>
>
> --
--
>
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami
>
>
>

Re: [AMRadio] BC-610 down=up

[W7QHO]

In a message dated 10/26/05 1:59:40 PM, [EMAIL PROTECTED] writes:


> As to folks ideas as to what constitutes a "long" wire, THE manual AND the 
> tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, & 
> 20 mtr bands, AND is very specific about the 77ft for 160 mtrs
> 
> The BC-939 is used EITHER for a 25ft  vertical whip, or the above mentioned 
> wire lengths.  When using the wire lengths as stated in the manual and tuning 
> cards, you MUST place the switch on the fron to the "Long Wire" position.
> 

The Army can call a 44 or 77 ft end fed wire antenna anything they want.   
The point, though, which I trust by now has been more than adequately made, it 
not to expect a stock BC-939 to work with the "long" wires most commonly used 
by hams and described in ham literature.   As I said before, I agree that the 
939 works fine with the antennas for which it was designed.   

In the past I owned the gray painted version of the device which came with my 
T368s.   Full of nice components and very well made but wouldn't match any of 
the antennas I had in use at the time.

Dennis D. W7QHO
Glendale, CA

Re: [AMRadio] BC-610 down=up

[Barrie Smith]

The BC-610, and the HT4-B both have the same final configuration, according 
to schematics I have for both.


A link-coupled output, at least in this instance, can feed either a balanced 
or an unbalanced line.


With both ends of the output link above ground, and attached to a balanced 
feeder, or load, the link can be adjusted to match the output to that load 
(unless that load is very much out of range out of range).


With one end of the link to ground (often through a variable capacitor), and 
the other end above ground, and conected to an unbalanced load, the link can 
match an unbalanced load, such as a 50 coax.


This scenario is entirely independent of whether the final is push-pull or 
single-ended.  It comes under the broad defination of "transformation".


73, Barrie, W7ALW
- Original Message - 
From: "Mike Sawyer" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 7:34 PM
Subject: Re: [AMRadio] BC-610 down=up


The BC-610 has an un-balanced output. Generally, had it been 'push-pull', 
it

would have been with a balanced output. In essence, it only utilizes half
the coil on the jack bar. I just had this very same conversation not too
long ago.
Mike(y)
W3SLK
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>

To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 8:47 PM
Subject: Re: [AMRadio] BC-610 down=up


Just curious, here.

Someone mentioned that the BC-610 has a 50 ohm output.  Well, I don't
remember ever having seen a BC-610, but I do have an HT4-B (the civilian
version of the BC-610, made in 1938), which does not (in stock form, at
least) have a 50 ohm output, it has a balanced output.

So, I may be talking about, and giving advice about, something else.

73, Barrie, W7ALW


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami

__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 down=up

[Mike Sawyer]

The BC-610 has an un-balanced output. Generally, had it been 'push-pull', it 
would have been with a balanced output. In essence, it only utilizes half 
the coil on the jack bar. I just had this very same conversation not too 
long ago.
Mike(y)
W3SLK
- Original Message - 
From: "Barrie Smith" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 8:47 PM
Subject: Re: [AMRadio] BC-610 down=up


Just curious, here.

Someone mentioned that the BC-610 has a 50 ohm output.  Well, I don't
remember ever having seen a BC-610, but I do have an HT4-B (the civilian
version of the BC-610, made in 1938), which does not (in stock form, at
least) have a 50 ohm output, it has a balanced output.

So, I may be talking about, and giving advice about, something else.

73, Barrie, W7ALW


__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami 

Re: [AMRadio] BC-610 down=up

[Barrie Smith]

Just curious, here.

Someone mentioned that the BC-610 has a 50 ohm output.  Well, I don't 
remember ever having seen a BC-610, but I do have an HT4-B (the civilian 
version of the BC-610, made in 1938), which does not (in stock form, at 
least) have a 50 ohm output, it has a balanced output.


So, I may be talking about, and giving advice about, something else.

73, Barrie, W7ALW 

RE: [AMRadio] BC-610 down=up and burnt't finals

[John E. Coleman (ARS WA5BXO)]

That would be class AB1 6146s in the speech amplifier.



Yep I guess I do know it pretty well.  The final was built in a push
pull configuration complete except for the extra tube and the extra
neutralizing capacitor.  Otis said, "I never put the other tube in because,
I didn't want to be accused of running illegal power".  

I operated that station more than any other visitor to Otis's place
and many times when he was away on trips to San Antonio and other places
with his mobile rig in the old black Cadillac.

The rig ran 3000 volts on the plates of final and modulators and the
final current was about 300 ma.  


The antenna was about 70 ft. high and pretty near flat top.  The RF
current meter that was in the RG8 coax line read 4 amps, until he went to
the folded dipole with 300 OHM feed line.

So for anybody that thinks Otis was ever illegal (OVER 1KW DC input)
HE WAS NOT

John, WA5BXO 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff
Sent: Wednesday, October 26, 2005 5:43 PM
To: Discussion of AM Radio
Subject: Re: [AMRadio] BC-610 down=up and burnt't finals


His homebrew speech-amp uses a pair of 6146's in Class B, to drive the
push-pull 833's.  


73 = Best Regards,
-Geoff/W5OMR



__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 down=up and burnt't finals

[W5OMR/Geoff]

John E. Coleman (ARS WA5BXO) wrote:


<>Not disputing any of what you said Bob.
I just remembered a funny situation where Otis, K5SWK, had some one 
else at
his rig controls. The rig was and is single 833 modulated by a pair 
and this
story was of many years ago. The person at the controls is now a 
silent key

but I still won't mention his name. The story goes that Otis was down the
street buying cigarettes, beer or something, and this person was visiting
from out of town. Not realizing the rig had had a arc over on the tuning
capacitor, that is never experiencing anything of that size before, the
operator continued to talk while the big pole pegs melted the plate of the
833 in the final. The 833 had a hole burnt through the plate the size of a
half dollar after the circuit breaker on the house when pop. The funny 
part

of this story is that that tube was a very good tube and continued to work
perfectly with out even a drop in grid current at full output. I ask Otis
if the tube showed any color and he said that he could not see the other
side but that on the side facing him there was no place for the tube 
to show

color. He did change the tube later because he said that it was just too
weird to look at the grid and heater through the hole and not see the 
normal

little red glow that was supposed to be there on the plate.

John, WA5BXO



Otis's rig, is the only rig I know, that could be operated with only 1 
of the pair of 833's in the modulator lit up, and no one could tell the 
difference.


His homebrew exciter was supposed to use a 4-65, but the only 4-65 he 
had got damaged, or something, so he hastily lashed up an adapter plate 
for a pair of 6146's.  Those are probably the same tubes that are in the 
exciter.  His homebrew speech-amp uses a pair of 6146's in Class B, to 
drive the push-pull 833's.  Everything in that station was homebrew.  
Oh, I don't mean he wound his own resistors, or blew glass to make tubes 
out of, but you know what I mean.. gather up a bunch of parts, assemble 
'em in such a way as to cooerce a butt-load of electrons out of the 
wall, into thin air, and have 'em reappear at the other end intact, 
again.  Ah, the magic of Radio and homebrewing!


I know you know all about the station there, John... but not everyone 
knows Otis' rig (or Otis, for that matter!) like you do.


Sure miss hearing that signal on the air.  Sure will be good to get him 
back on, soon.


--
73 = Best Regards,
-Geoff/W5OMR

RE: [AMRadio] BC-610 down=up and burnt't finals

[John E. Coleman (ARS WA5BXO)]

Not disputing any of what you said Bob.  
I just remembered a funny situation where Otis, K5SWK, had some one else at
his rig controls. The rig was and is single 833 modulated by a pair and this
story was of many years ago.  The person at the controls is now a silent key
but I still won't mention his name.   The story goes that Otis was down the
street buying cigarettes, beer or something, and this person was visiting
from out of town.  Not realizing the rig had had a arc over on the tuning
capacitor, that is never experiencing anything of that size before, the
operator continued to talk while the big pole pegs melted the plate of the
833 in the final.  The 833 had a hole burnt through the plate the size of a
half dollar after the circuit breaker on the house when pop.  The funny part
of this story is that that tube was a very good tube and continued to work
perfectly with out even a drop in grid current at full output.  I ask Otis
if the tube showed any color and he said that he could not see the other
side but that on the side facing him there was no place for the tube to show
color.  He did change the tube later because he said that it was just too
weird to look at the grid and heater through the hole and not see the normal
little red glow that was supposed to be there on the plate.

John, WA5BXO   

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, October 26, 2005 3:58 PM
To: Discussion of AM Radio; Discussion of AM Radio
Subject: Re: [AMRadio] BC-610 down=up

As to folks ideas as to what constitutes a "long" wire, THE manual AND the
tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, &
20 mtr bands, AND is very specific about the 77ft for 160 mtrs

The BC-939 is used EITHER for a 25ft  vertical whip, or the above mentioned
wire lengths.  When using the wire lengths as stated in the manual and
tuning cards, you MUST place the switch on the fron to the "Long Wire"
position.

Seems interesting to me that this old radio was used in WWII, Korea, AND
Viet Nam with all of this working JUST FINE.

If you don't like the BC-939 and its settings, you just erect dipoles for
each band desired.  Just DON'T use a trap dipole.  You WIL NOT get a proper
tune and load!  
Of course if you want to stock up on a BUNCH of 250THs, you CAN have it you
way.  I've got one that someone sent me when they insisted on THEIR way.
There is very definitive light all the way through opposing sides in the
middle of the plate.

YMMV
Bob - N0DGN
My 250THs are just fine!


> On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >
> > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:
> >
> > > Actually,
> > > The BC-939 (*) handles an end fed long wire, the recommended length
for
> > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters
and
> > > works quite well.
> > >
> > Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18
MHz.
> >   The term is usually used to describe wires measured in wavelengths as
> > opposed to feet and inches, see various ARRL and other antenna books.
> 
> Apparently Hallicrafters and/or the military considered it long enough
> to qualify since the 3 position switch on front of the tuner has 'long
> wire' specifically listed in the center position. My guess is that
> they considered any random length beyond what would qualify as a
> 'whip' to be a long wire, perhaps in the spirit of the original term.
> 
> The odd thing about my A model is that the lower vacuum cap has been
> removed and replaced with an air capacitor, screwed to the base with
> heavy wire soldered to each of the two clips. It resembles a moderate
> sized air variable but with only 5-6 stationary plates. Looks to
> either be factory installed or later upgraded. Haven't had time yet to
> investigate the value or rating.
> 
> Very well-built piece of equipment, even if it has limited utility.
> 
> ~ Todd/'Boomer'  KA1KAQ
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami
__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 down=up

[rbethman]

As to folks ideas as to what constitutes a "long" wire, THE manual AND the 
tuning cards for the BC-610 are VERY specific about the 44 ft for 80, 40, & 20 
mtr bands, AND is very specific about the 77ft for 160 mtrs

The BC-939 is used EITHER for a 25ft  vertical whip, or the above mentioned 
wire lengths.  When using the wire lengths as stated in the manual and tuning 
cards, you MUST place the switch on the fron to the "Long Wire" position.

Seems interesting to me that this old radio was used in WWII, Korea, AND Viet 
Nam with all of this working JUST FINE.

If you don't like the BC-939 and its settings, you just erect dipoles for each 
band desired.  Just DON'T use a trap dipole.  You WIL NOT get a proper tune and 
load!  
Of course if you want to stock up on a BUNCH of 250THs, you CAN have it you 
way.  I've got one that someone sent me when they insisted on THEIR way.  There 
is very definitive light all the way through opposing sides in the middle of 
the plate.

YMMV
Bob - N0DGN
My 250THs are just fine!


> On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >
> > In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:
> >
> > > Actually,
> > > The BC-939 (*) handles an end fed long wire, the recommended length for
> > > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and
> > > works quite well.
> > >
> > Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18 
> > MHz.
> >   The term is usually used to describe wires measured in wavelengths as
> > opposed to feet and inches, see various ARRL and other antenna books.
> 
> Apparently Hallicrafters and/or the military considered it long enough
> to qualify since the 3 position switch on front of the tuner has 'long
> wire' specifically listed in the center position. My guess is that
> they considered any random length beyond what would qualify as a
> 'whip' to be a long wire, perhaps in the spirit of the original term.
> 
> The odd thing about my A model is that the lower vacuum cap has been
> removed and replaced with an air capacitor, screwed to the base with
> heavy wire soldered to each of the two clips. It resembles a moderate
> sized air variable but with only 5-6 stationary plates. Looks to
> either be factory installed or later upgraded. Haven't had time yet to
> investigate the value or rating.
> 
> Very well-built piece of equipment, even if it has limited utility.
> 
> ~ Todd/'Boomer'  KA1KAQ
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 down=up

[Mike Sawyer]

The way I understand is that the BC-939 was a helluva TVI generator. What is 
neat is that they used the exact same thing for the BC-610's younger 
brother, the T-368. Only difference is they put it in a battleship grey box.
Mike(y)
W3SLK

- Original Message - 
From: "Todd, KA1KAQ" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio" 
Sent: Wednesday, October 26, 2005 9:23 AM
Subject: Re: [AMRadio] BC-610 down=up


On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:
>
> > Actually,
> > The BC-939 (*) handles an end fed long wire, the recommended length for
> > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and
> > works quite well.
> >
> Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18 
> MHz.
>   The term is usually used to describe wires measured in wavelengths as
> opposed to feet and inches, see various ARRL and other antenna books.

Apparently Hallicrafters and/or the military considered it long enough
to qualify since the 3 position switch on front of the tuner has 'long
wire' specifically listed in the center position. My guess is that
they considered any random length beyond what would qualify as a
'whip' to be a long wire, perhaps in the spirit of the original term.

The odd thing about my A model is that the lower vacuum cap has been
removed and replaced with an air capacitor, screwed to the base with
heavy wire soldered to each of the two clips. It resembles a moderate
sized air variable but with only 5-6 stationary plates. Looks to
either be factory installed or later upgraded. Haven't had time yet to
investigate the value or rating.

Very well-built piece of equipment, even if it has limited utility.

~ Todd/'Boomer'  KA1KAQ






__
AMRadio mailing list
Home: http://mailman.qth.net/mailman/listinfo/amradio
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:AMRadio@mailman.qth.net
AMfone Website: http://www.amfone.net
AM List Admin: Brian Sherrod/w5ami 

Re: [AMRadio] BC-610 down=up

[Todd, KA1KAQ]

On 10/26/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>
> In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:
>
> > Actually,
> > The BC-939 (*) handles an end fed long wire, the recommended length for
> > 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and
> > works quite well.
> >
> Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18 MHz.
>   The term is usually used to describe wires measured in wavelengths as
> opposed to feet and inches, see various ARRL and other antenna books.

Apparently Hallicrafters and/or the military considered it long enough
to qualify since the 3 position switch on front of the tuner has 'long
wire' specifically listed in the center position. My guess is that
they considered any random length beyond what would qualify as a
'whip' to be a long wire, perhaps in the spirit of the original term.

The odd thing about my A model is that the lower vacuum cap has been
removed and replaced with an air capacitor, screwed to the base with
heavy wire soldered to each of the two clips. It resembles a moderate
sized air variable but with only 5-6 stationary plates. Looks to
either be factory installed or later upgraded. Haven't had time yet to
investigate the value or rating.

Very well-built piece of equipment, even if it has limited utility.

~ Todd/'Boomer'  KA1KAQ

Re: [AMRadio] BC-610 down=up

[W7QHO]

In a message dated 10/25/05 8:18:51 PM, [EMAIL PROTECTED] writes:


> Actually,
> The BC-939 (*) handles an end fed long wire, the recommended length for
> 2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and
> works quite well.
> 
Actually,   a 44 (or 77) ft antenna is not a very "long" wire even at 18 MHz. 
  The term is usually used to describe wires measured in wavelengths as 
opposed to feet and inches, see various ARRL and other antenna books.   

Agree the BC-939 works well when used with the short antennas for which it 
was designed.

Dennis D. W7QHO
Glendale, CA

Re: [AMRadio] BC-610 down=up

[James M. Walker]

Actually,
The BC-939 (*) handles an end fed long wire, the recommended length for
2 - 18 Mhz is 44 feet. That number changes to 77 feet for 160 meters and
works quite well. At my Rochester, NY QTH I used four or the 44 ft.
end fed long wires oriented to the cardinal points. the system worked
quite well into Europe, and Asia, and South America, using my BC-610 on
CW and RTTY.

I also used a full size 160 meter Loop fed with open wire line to a
homebrew antenna tuner which coupled the 50 ohm output of the BC-610
to the open wire feed-line. The BC-939 work quite well as long as it
is used as it was designed to be used.

As for the whip antenna, that measures 15 feet and is used in mobile
work
from the shelter that housed the AN/GRC-26 that used the BC-610 and
a pair BC-348 receivers. Been there, done that!

Lots of folks try to couple to a dipole antenna, the correct use is to
use the whip also when the vehicle is parked, and put in an 8 foot
ground out to aid in the matching to the whip or long-wire.

If you cut a dipole to "a correct length" for the operating frequency
then you can feed it with 50 ohm coax and plug that into the BC-610
output connector which is 50 ohms.

FWIW Your mileage may vary.
Jim
WB2FCN


Barrie Smith wrote:
> 
> Todd:
> 
> You mentioned that you have the '939 antenna tuner that matches the BC-610.
> I have one, as well.  Be aware that this tuner is designed to match a
> (relatively) short whip, only.
> 
> Won't do a thing for you on any "normal" ham antenna.
> 
> 73, Barrie, W7ALW
> 
> __
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio@mailman.qth.net
> AMfone Website: http://www.amfone.net
> AM List Admin: Brian Sherrod/w5ami

Re: [AMRadio] BC-610 down=up

[Barrie Smith]

Todd:

You mentioned that you have the '939 antenna tuner that matches the BC-610. 
I have one, as well.  Be aware that this tuner is designed to match a 
(relatively) short whip, only.


Won't do a thing for you on any "normal" ham antenna.

73, Barrie, W7ALW 

Re: [AMRadio] BC-610 down=up

[Todd, KA1KAQ]

On 10/25/05, VJB <[EMAIL PROTECTED]> wrote:
> Todd,
>
> I bet you will find the filament rheostat has a dead
> spot in part of its travel, where the brush rested for
> years until someone swapped the wires so that the
> OTHER part of the excursion now gets used.
>
> People do this with spigots too, where off = on.

To be honest, I haven't had time to do much more than a cursory
checkover before powering up, so anything is possible. It's not my
intention to try to actually load, tune, or in any way use the
transmitter until I have a manual in front of me and have cleaned up
more of the mess. I really just wanted to make sure it functioned at a
basic level before I started removing the rat's nest of wires added
for audio. Fil. control seems smooth over the small distance I
covered, but I didn't play with it much for fear of cooking toobs!

> OK, now that you've sampled the BC-610, when are you
> getting after the Collins 300-G ?  It's not that it
> needs much...

Not much, but more than you'd think. Mainly, I need to get the large
ceramic tank coil back from Ray if he has it re-wound and get it
reinstalled, then I can put the rest up top back together and get the
iron back in. The lower deck needs paint, but that's an hour or two
tops, and repainting the iron won't be an issue. The trick is going to
be repairing and replacing (source?) that black HV wire going to the
large oil filled caps on top, all chopped up from that Gates power
reduction unit I have since removed.

I'd like to have it going Thanksgiving weekend, so that it gets a
shakedown run or two before the HMR. Of course, I still need to figure
out how to make the 160m 'homebrew dipole' <*slapping knee*> fit my
property. No crystals either, but Barry gave me the VFO cord he used
with it, which plugs into one of the 40F oscillators. Should work fine
lashed to one of those T-368 PTO/VFO units like you use?

Maybe 1-2 good weekends of work, once everything else like winterizing
the house is done, and another 300G should be joining the ranks on
160. Wx here in the northeast has been anything but helpful.

~ Todd,  KA1KAQ

[AMRadio] BC-610 down=up

[VJB]

Todd,

I bet you will find the filament rheostat has a dead
spot in part of its travel, where the brush rested for
years until someone swapped the wires so that the
OTHER part of the excursion now gets used.

People do this with spigots too, where off = on.


OK, now that you've sampled the BC-610, when are you
getting after the Collins 300-G ?  It's not that it
needs much...

Paul/VJB






__ 
Yahoo! FareChase: Search multiple travel sites in one click.
http://farechase.yahoo.com

[AMRadio] BC-610-E follow up

[Todd, KA1KAQ]

Again, apologies to those who subscribe to multiple lists, butWOW!

I can't believe how many responses I got to my request for information
and help with the BC-610-E. For years I'd had the impression that the
BC-610 wasn't the transmitter one would want, if they could choose. So
instead of being shunned for having "one of THOSE things", I was
instead suprised to find so much knowledge, experience, and generosity
from folks out there. Seems the 'Beastly 610' has quite a following!

A number of folks asked for more information with regard to paint,
price, and overall condition. Since the weekend had one day of snow
and rain up this way, I had some inside time to check it out more.

First, I purchased this transmitter from Ray, KC1BT who got it from a
friend of his who wanted it gone. What Ray paid I do not know, but I
paid $350 for the transmitter itself including the three installed
tuning units and 80m coil, kluged-in audio module, and low pass filter
w/antenna on side and relay hung on the back. The BC-939-A antenna
tuner has been with me since 1990 or so, in hopes that keeping it
would result in its sprouting a transmitter. I didn't even water it
regularly and it worked.

Overall condition to me seems like good to very good, all mods
considered. The paint has a few small chips, numerous scratches, and
the top cover appears to have been oversprayed at some point along
with the liberal application of DANGER HIGH VOLTAGE stickers inside
the two opening lids and on mod deck apron. The left front panel has
three added holes for a gain control and two 1/4" mic jacks. There are
a few small screw holes on the left side for the lowpass filter and
also on back for the antenna relay. The gaping hole on the side for
the coax was actually already there, but the original feedline
insulators are missing. Chassis themselves are dusty but overall
fairly clean and in decent shape. Paint looks good on them and no
additional holes blasted through anywhere.

Missing parts seem to be the antenna insulators, bottom back relay
cover, and rear cover or screen to cover the back of the transmitter.
Also the associated interlock switch is missing. The 20A fuse holder
on front is cracked but not yet broken badly enough to be a problem.
The two meters on the right side have both been swapped to round
meters and a small mA meter in a box with about 20' of cable has been
tacked under the mod deck with original harness wires left dangling.

Yesterday after replacing the 2A3 I broke with a weak but functional
replacement, I got brave and powered it up (after checking the rat's
nets of audio wires to be sure nothing would zorch). Oh - had to
replace the 5Z3 also since it pulled free of its base when I removed
it for transport.

Threw the filaments switch and on came the dial and tuning unit
lights, along with the big green filament power light. The mismatched
100th modulators (one with porcelain base and internal fins, one with
metal base and smooth) lit up brightly as did the 250TH and
eventually, the smaller octal tubes. Turning the filament voltage
control down made the meter indication go upwards, though, so
something seems hokey there. Tried the plate switch, no joy. Pushed
the reset button, tried a few more times, finally got the big, red
light to ignite. Had a little trouble with one 2A3 not wanting to
light, swapped them around and discovered the securing base was the
issue, keeping the tube from going all the way in for good contact.

That's as far as I got with it. There's life yet in the old girl! My
plan now is to remove the speech amp/audio mess but to leave enough
wire when I cut it out so that I can mount it remotely and hook it
back up if desired, until I located a BC-614-E speech amp. A good
cleaning throughout and testing of tubes along with removal and
replacement of the weird stuff hung on it is in order, too. My goal
isn't to make it a museum piece (I don't have enough money) but to
restore it to its proper working configuration as well as cosmetically
to a level it deserves.

Through the kindness of list members I have received everything from
suggestions on tuning it to prevent TVI, to 2A3s (should be all set
here now, thanks), to antenna configurations used with the tuner and
many stories of personal use and experiences. I hope I can repay this
generosity when others are in need.

73, and thanks again to all -

de Todd/'Boomer'  KA1KAQ

[AMRadio] BC-610 XFMR

[Patrick Jankowiak]

I apologize, I don't hace it anymore. I went to look at it, and remembered 
I let it go with a KW 2M amp last year.


I must be getting oldzheimers' or something.

From: Patrick Jankowiak <[EMAIL PROTECTED]>

If anyone wants a BC-610 transformer, ...